Chia động từ At that time i (not know) what to do since i was too suprised. Giải thích giúp mình với ạ

At that time I haven't known what to do since I was too suprised

HTHT + since + QKĐ

Cấu trúc thì hiện tại hoàn thành:

(+) S + has/ have + V_ed/ V3

(- ) S + has/ have + not + V_ed/ V3

(? ) Has/ Have + S + V_ed/ V3?

Cấu trúc thì quá khứ đơn:

*Động từ thường:

(+) S + V_ed/ V2

(- ) S + didn't+ V_inf

(? ) Did + S + V_inf?

*Động từ to be:

(+) S + was/ were + ...

(- ) S + was/ were + not + ...

(? ) Was/ Were + S + ...