for + 1 khoảng thời gian 

since + 1 mốc thời gian

14 for 

15 since 

16 since 

17 for 

18 for 

19 since 

20 for

II

1 he has had a cold for a week

-> thì HTHT

-> s + have / has + VPII 

2 they have bought that house since apiril

-> thì HTHT

-> s + have / has + VPII 

3 my family have been here since chritsmast

-> thì HTHT

-> s + have / has + VPII 

4 we haven't seen each other for 10 years 

-> thì HTHT

-> s + have / has + VPII 

5 mrclack  has work in the bank for a long time

-> thì HTHT

-> s + have / has + VPII 

14,for

đây là khoảng thời gian

15,since

đây là mốc thời gian

16,for

đây là khoảng thời gian

17,for

đây là khoảng thời gian 

18,for

đây là khoảng thời gian

19,since

đây là mốc thời gian

20,since

đây là mốc thời gian

Ex2

1,He has had a cold for a week

thì HTHT

công thức

S+have/has+V(ed/BQT3)+O

2,They have bought the new house since Aprill

thì HTHT

công thức

S+have/has+V(ed/BQT3)+O

3,My family has been here since chist

thì HTHT

công thức

S+have/has+V(ed/BQT3)+O

4,we haven't seen each other for 10 years

thì HTHT

công thức

S+have/has+V(ed/BQT3)+O

5,Mr . clark has worked in the bank for a long time

thì HTHT

công thức

S+have/has+V(ed/BQT3)+O