Review on the tenses ! 1 - Simple Present

Firstly, I'm sorry to post subject in the wrong place.
Secondly, Hi everybody !
since a few minutes I've finished studying of all tenses and I've written some sentences and i need performance evaluation
below each tense you will find the sentences.
I know that there are many mistakes into them.
So, please focus in explain the reason for the amendment in each tense, because i want to understand my mistake and don't repeat it.

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1- does he teach english ? no, he dosen't .... no,he dosen't teach english. ----------------
2- do the men drink tea ? no, the men don't ....... no,the men don't drink tea. ----------------
3- do they speak a little english ? no, they don't .... no, they don't speak a little english. ----------------
4- does janet like chocolate ? no, janet don't .... no, janet don't like chocolate. ----------------
5- does he work at his desk ? no, he doesn't work at his desk .... no, he doesn't. ----------------
6- does it cost a pound ? no, it doesn't ..... no, it doesn't cost a pound. ----------------
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7- the police man often directs the traffic. ----------------
8- butchers sell meat. ----------------
9- he generally wears a brown suit. ----------------
10- the boys and girls go to the seaside everyday. ----------------
11- the earth moves round itself. ----------------
12- cats eat mice. ----------------
13- a teacher works hard. ----------------
14- we speak english in the english lessons. ----------------
15- in spain women usually not wear hats. ----------------
16- you always write with your left hand. ----------------
17- he always borrows from me and never remember to pay me back. ----------------