It depends on what tense you are writing in. The forms of come are:
come -- base verb - They always come late.
comes -- present third person singular - She never comes late.
came -- past - Everybody came late yesterday.
come -- past participle - You have come late too many times.
coming -- present participle - They are comingearly now.
The verb of thick is thicken. As in "to thicken something".
No. Adverbs are words that describe a verb. Were is a past tense verb, a form of "to be."
Should is a modal verb, should not is the negative form.
To complicate
Thicken
The correct form is When did I come? (I did come when).
"Did he come" is correct. "Do" used this way is an auxiliary verb and is always followed by the base form (infinitive) of the main verb.
The correct form is "Did he come today?" The auxiliary verb "did" is followed by the base form of the main verb "come" in questions in the past simple tense.
The correct form is "had come." "Come" is the past participle form of the verb "come" and is used after "had" to indicate an action that occurred before a certain point in the past. "Came" is the simple past form of the verb "come" and cannot be used after "had" in this context.
The correct sentence is "She didn't come." "Come" is the past participle of the verb "to come," so it should be used with the auxiliary verb "do" in the negative form as in this sentence.
The correct wording is "have they ever come".
"It didn't come in" is correct. The verb "come" is irregular, so the past tense is "came." Combining "did" with the base form "come" creates the correct negative past tense form.
"It didn't come up" is correct. The verb "come" should be in the base form after "didn't."
"You have begun" is correct.
The correct form of the verb "promise" in the sentence "He did as he promised." is already correct.
"She didn't come" is the correct way of saying this. You could say "She never came" or "She didn't want to come" or "It was her fault she didn't come and nothing to do with me" or "It doesn't matter whether she came or not" After a form of 'to do' you always say the infinite vrom of the verb
in that form no, but grumble is. Grumbled is the past tense form of the verb grumble :)