Mình làm đại ạ !! Mn chia thì giúp mình vss

Công thức thì HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

DHNB: now, right now, (!), at present, at the moment,.....

Công thức thì HTHT

(+) S + has/have + V3/ed 

(-) S + has/have + not + V3/ed 

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

DHNB: before, since + mốc thời gian, for + khoảng thời gian, yet, already, just,..

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

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6. are working

DHNB: now (HTTD)

7. has just bought 

DHNB: just (HTHT)

8. has done 

DHNB: up to the present (HTHT)

9. have seen 

10. have you learnt / came 

HTHT + since + QKD

11. has worked 

DHNB: so far (HTHT)

12. broke 

DHNB: ago (QKD)

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