When people need to complain about a product or poor service, some prefer to complain in writing and others prefer to complain in person.Which way do you prefer?Use specific reasons and examples to support your answer.

Grammar and spelling errors:
Line 3, column 461, Rule ID: WHITESPACE_RULE
Message: Possible typo: you repeated a whitespace
Suggestion:
...etters as being sent by their one of the true loyal customers which can have sign...
^^

Transition Words or Phrases used:
also, but, however, if, really, so, therefore, well, while, i mean, in conclusion, no doubt, in my opinion, to begin with, on the other hand

Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments

Performance on Part of Speech:
To be verbs : 13.0 13.1623246493 99% => OK
Auxiliary verbs: 5.0 7.85571142285 64% => OK
Conjunction : 7.0 10.4138276553 67% => OK
Relative clauses : 11.0 7.30460921844 151% => OK
Pronoun: 26.0 24.0651302605 108% => OK
Preposition: 52.0 41.998997996 124% => OK
Nominalization: 4.0 8.3376753507 48% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.

Performance on vocabulary words:
No of characters: 1647.0 1615.20841683 102% => OK
No of words: 316.0 315.596192385 100% => OK
Chars per words: 5.21202531646 5.12529762239 102% => OK
Fourth root words length: 4.21620550194 4.20363070211 100% => OK
Word Length SD: 3.04853616425 2.80592935109 109% => OK
Unique words: 209.0 176.041082164 119% => OK
Unique words percentage: 0.661392405063 0.561755894193 118% => OK
syllable_count: 522.9 506.74238477 103% => OK
avg_syllables_per_word: 1.7 1.60771543086 106% => OK

A sentence (or a clause, phrase) starts by:
Pronoun: 6.0 5.43587174349 110% => OK
Interrogative: 1.0 0.384769539078 260% => OK
Article: 4.0 2.52805611222 158% => OK
Subordination: 3.0 2.10420841683 143% => OK
Conjunction: 1.0 0.809619238477 124% => OK
Preposition: 6.0 4.76152304609 126% => OK

Performance on sentences:
How many sentences: 15.0 16.0721442886 93% => OK
Sentence length: 21.0 20.2975951904 103% => OK
Sentence length SD: 45.3576405422 49.4020404114 92% => OK
Chars per sentence: 109.8 106.682146367 103% => OK
Words per sentence: 21.0666666667 20.7667163134 101% => OK
Discourse Markers: 9.33333333333 7.06120827912 132% => OK
Paragraphs: 4.0 4.38176352705 91% => OK
Language errors: 1.0 5.01903807615 20% => OK
Sentences with positive sentiment : 11.0 8.67935871743 127% => OK
Sentences with negative sentiment : 1.0 3.9879759519 25% => More negative sentences wanted.
Sentences with neutral sentiment: 3.0 3.4128256513 88% => OK
What are sentences with positive/Negative/neutral sentiment?

Coherence and Cohesion:
Essay topic to essay body coherence: 0.0982025639006 0.244688304435 40% => OK
Sentence topic coherence: 0.0271381339861 0.084324248473 32% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.051864071089 0.0667982634062 78% => OK
Paragraph topic coherence: 0.0610209570317 0.151304729494 40% => OK
Paragraph topic coherence SD: 0.0829394424468 0.056905535591 146% => OK

Essay readability:
automated_readability_index: 13.6 13.0946893788 104% => OK
flesch_reading_ease: 41.7 50.2224549098 83% => OK
smog_index: 8.8 7.44779559118 118% => OK
flesch_kincaid_grade: 12.7 11.3001002004 112% => OK
coleman_liau_index: 12.94 12.4159519038 104% => OK
dale_chall_readability_score: 9.57 8.58950901804 111% => OK
difficult_words: 98.0 78.4519038076 125% => OK
linsear_write_formula: 11.0 9.78957915832 112% => OK
gunning_fog: 10.4 10.1190380762 103% => OK
text_standard: 13.0 10.7795591182 121% => OK
What are above readability scores?

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Rates: 89.8876404494 out of 100
Scores by essay e-grader: 8.0 Out of 9
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.

the application of writing for having complaints tend to be usually addressed
the application of writing for having complaints tends to be usually addressed

it's importance cannot be underestimated.
its importance cannot be underestimated.

both forms of complaints proves really valuable
both forms of complaints prove really valuable

flaws:
No. of Grammatical Errors: 3 2

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Attribute Value Ideal
Final score: 8.0 out of 9
Category: Excellent Excellent
No. of Grammatical Errors: 3 2
No. of Spelling Errors: 1 2
No. of Sentences: 15 15
No. of Words: 316 350
No. of Characters: 1598 1500
No. of Different Words: 206 200
Fourth Root of Number of Words: 4.216 4.7
Average Word Length: 5.057 4.6
Word Length SD: 2.947 2.4
No. of Words greater than 5 chars: 115 100
No. of Words greater than 6 chars: 93 80
No. of Words greater than 7 chars: 59 40
No. of Words greater than 8 chars: 47 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 21.067 21.0
Sentence Length SD: 8.161 7.5
Use of Discourse Markers (%): 0.733 0.12
Sentence-Text Coherence: 0.279 0.35
Sentence-Para Coherence: 0.511 0.50
Sentence-Sentence Coherence: 0.06 0.07
Number of Paragraphs: 4 5

Thank you sir.

the application of writing for having complaints tend to be usually addressed
the application of writing for having complaints tends to be usually addressed

both forms of complaints proves really valuable
both forms of complaints prove really valuable

Dear sir, I would like to ask in these two sentences, verb 'tends' and 'prove' have to agree with which subjects ? Because I believe this is my third time which I have been repeating and I really find it difficult. So with your valuable suggestions, I hope, I will not repeat the grammatical errors again. I look forward to your expert opinion sir. Thank you sir.