Dear Sue,
   I think you (have) are having a holiday now. I started at the language school on Monday. I go everyday. Vince usually (take) takes me in the car, because he (go) goes to work at the same time. But he (not bring) doesn't bring me home because he (finish) finished later than me. So I get the bus.
   Our first lesson (start) starts at a quarter past nine and we (finish) finished at one o'clock for lunch. We get a lot of homework. I (do) am doing it at the moment. Well, I (not do) am not doing it precisely at the moment because I am (write) writting this letter for you, but you know what I (mean) mean.
   I met the members of Vince's band the other day. I like Rosy, but I (not/know) don't know about Dan and Kim. I think Kim is a bit jealous, because I (stay) have stayed with your family while I am in England. Actually they are all in Vince's bedroom at the moment. They (practice) are practising some songs. They are making a lot of noise, but it (sound) sounds good. Your Mum and Dad are well. Your Dad (mend) is mending the car outside and your Mum (watch) is watching television.
   Well, I suppose I had better (finish) finish my homework. I (write) will write to you again soon. Bye for now.

*Cấu trúc thì hiện tại tiếp diễn: S + is/ am/ are + V_ing. (Dấu hiệu: "now").

*Cấu trúc thì hiện tại đơn:

1. Câu khẳng định.

- Với động từ tobe: S + is/ am/ are + N/Adj.

- Với động từ thường: S + V(s/ es). 

2. Câu phủ định.

- Với động từ tobe: S + is/ am/ are + not + N/Adj. 

- Với động từ thường: S + do/ does + not + V_inf.    (Dấu hiệu: "usually").

*Cấu trúc thì hiện tại hoàn thành: S + have/ has + V_ed/ V3.

(Dấu hiệu: "have stayed").

*Cấu trúc thì tương lai đơn: S + will/ shall + V_inf. (Dấu hiệu: "soon").

*Chúc bạn học tốt! ^_^