5 Can you help me? I ...................(find out) what time London train arrives. 6 He looks very annoyed. He.............(wait) for ages. 7 I...............(take) the library books back yesterday but i forgot and now i'll have to pay a fine.

$\text{5,}$ don't find out 

$\rightarrow$ find out (phr V) tìm ra

$\rightarrow$ Câu phủ định: I + don't + V + O.

$\text{6,}$ has been waiting

$\rightarrow$ has been + Ving: đã từng

$\rightarrow$ Công thức: S + have + been + Ving…

$\text{7,}$ took

$\rightarrow$ Dấu hiệu nhận biết thì quá khứ đơn: yesterday.