The correct form of the verb "promise" in the sentence "He did as he promised." is already correct.
In the sentence 'She replied that she felt better' yes, felt is a correct form in this sentence.
The correct form is When did I come? (I did come when).
The correct possessive form in this sentence is "wife's."
No because the linking verb you use is in the past subjunctive plural form but you must use "was" a past indicative plural form.
i did not went yesterday. is this sentnce correct?
In the sentence 'She replied that she felt better' yes, felt is a correct form in this sentence.
The correct form is When did I come? (I did come when).
The correct possessive form in this sentence is "wife's."
Elder should be corrected to older.
The form of this sentence is correct. She filled out the application form.
To make this sentence correct you should say "the plan has been met with opposition".
The sculpture was free-form. This is a correct sentence if you capitalize first letter.
No because the linking verb you use is in the past subjunctive plural form but you must use "was" a past indicative plural form.
i did not went yesterday. is this sentnce correct?
If you were to quote correctly the sentence we could venture an answer.
no, the verb that comes after will is always verb 1 !
I have no idea what you mean by "checkout of a text", but slang apart, the words form simply a phrase, neither sentence nor clause.