who can help me ''to speak english'' ..

only if you want each me ''talking''

You can say this several ways.

1.  Only if you want to teach me to speak English.

2.  If you want, you can teach me English.

We use "speak English" with the verbs "teach, learn, speak" for example:

1.  Can you teach me to speak English?  not, Can you teach me to talk English?
2.  I want to learn to speak English. not, I want to learn to talk English.

I hope this help, mico.  Jeanne