Conjugation of verb "To study"
Present Simple Continuous
Negative
He/She/It isn't studying.
Negative
He/She/It wasn't studying.
Negative
He/She/It hasn't studied.
Present Perfect Continuous
Affirmative
He/She/It's been studying.
Negative
You haven't been studying.
We haven't been studying.
He/She/It hasn't been studying.
You haven't been studying.
They haven't been studying.
Interrogative
Has he/she/it been studying?
Negative
He/She/It hadn't studied.
Affirmative
He/She/It'd been studying.
Negative
You hadn't been studying.
He/She/It hadn't been studying.
You hadn't been studying.
They hadn't been studying.
Interrogative
Had he/she/it been studying?
Affirmative
He/She/It'll have studied.
Negative
He/She/It won't have studied.
Interrogative
Will he/she/it have studied?
Negative
He/She/It wouldn't study.
Affirmative
He/She/It'd have studied.
Negative
You wouldn't have studied.
We wouldn't have studied.
He/She/It wouldn't have studied.
You wouldn't have studied.
They wouldn't have studied.
Interrogative
Would he/she/it have studied?