Vietnamese Verb "ngủ" — to sleep
Simple / Bare Verb
The bare verb with no marker. Context determines whether it refers to present, past, or habitual action.
Structure: Subject + ngủ
Tôi ngủ.
I sleep / I slept.
Past / Completed (đã)
The marker "đã" before the verb explicitly marks a completed action or past event.
Structure: Subject + đã + ngủ
Tôi đã ngủ.
I slept / I have slept.
Progressive (đang)
The marker "đang" expresses an action currently in progress.
Structure: Subject + đang + ngủ
Em đang ngủ.
He/she is sleeping.
Future (sẽ)
The marker "sẽ" expresses a future action or intention.
Structure: Subject + sẽ + ngủ
Tôi sẽ ngủ sớm.
I will sleep early.
Negative (không / chưa)
"Không" negates the verb generally. "Chưa" means "not yet" — implying the action may happen later.
Structure: Subject + không + ngủ
Tôi không ngủ được.
I can't sleep.
Structure: Subject + chưa + ngủ
Tôi chưa ngủ.
I haven't slept yet.
Experience / Other (đã từng / vẫn)
"Đã từng" marks past experience ("have ever done"). "Vẫn" means "still" for ongoing states.
Structure: Subject + vẫn + ngủ
Anh ấy vẫn ngủ.
He is still sleeping.
Example Sentences
Ngủ ngon!
Sleep well! / Good night!
Tôi đã ngủ 8 tiếng.
I slept 8 hours.
Em bé đang ngủ.
The baby is sleeping.