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"Yesterday" is used for the past, "now" for the present, and "tomorrow" for the future in these sample sentences. Many of these verbs must have an object, for example: The snake shed (object) yesterday. = The snake shed its skin yesterday.
Use for Present Tense - for 3rd person singular only, add "s" to bare stem - singular subject (verb + s) now.
John quits now.
Jane quits now.
He quits now.
She quits now.
It quits now.
All others, do not add "s" to the bare stem - subject (verb) now.
They quit now.
Simple Past Tense - do not add anything to verb - subject (verb) yesterday.
John quit yesterday.
They quit yesterday.
Past Participle - do not add anything to verb.
Use for Present Perfect - subject has/have (verb), note: use "has" for 3rd person singular only, all others use "have":
John has quit. He has quit.
They have quit.
Use for Past Perfect - subject had (verb).
John had quit yesterday.
They had quit yesterday.
Use for Future Perfect - subject will have (verb) tomorrow.
John will have quit tomorrow.
They will have quit tomorrow.
|Column One||Column Two||Column Three|
|Bare Stem||Simple Past Tense||Past Participle|
add "s" only for 3rd person singular
He (verb + s) now.
They (verb) now.
|He (verb) yesterday.
It (verb) yesterday.
They (verb) yesterday.
|He has (verb). It has (verb).
They have (verb).
He had (verb) yesterday.
He will have (verb) tomorrow.
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