Grammer Mistakes Made : Often repeated ones

1. Everyone is a collective noun and all collective nouns must take singular verb.
2. one-hundred-and-twenty percent, Needless to say, are considered wordy
3. after comma, be careful of participial phrases
4. use plural verb whenever subjects are combined with ' and'
5. anticipate shd be followed by gerund.. personnel is group of persons...
6. when plural subject(esp has,have) is used, look for verb, best or better, among or between
7. Whenever "than" is present verb in both sides must be similar.
8.The original contains a verb mood error. “If adolescence was” is improper subjunctive. “Was” should not be used in an “if” clause indicating a hypothetical condition. "If adolescence were” is correct
9. difference between "that" and "which": The modifier uses the relative pronoun “that,” but “that” should only introduce essential modifiers. “Which” is a better choice here, since the modifying phrase is non-essential.
10."in that " is considered overly formal. donot use it in gmat
11. as a means to is correct idiom
12. is attributed to
13. enrollements is plural
14.just as y; so x