I have doubts. when must I use " how far " "how further " ?

How can I use : WHICH and THAT ? I'd like to have some examples.

How acn I use : "ought to " When can I use " ought to " ? Could you give me some examples ? thanks.

MEAN - MEANT - MEANING WHEN CAN I USE : mean -- meant - meaning ?

HAVE TO OR MUST ? When can i use : have to and MUST

as son as ------ SO AND EITHER How can I use : AS SOON AS SO AND NEITHER

How can I use the modal verbs : may might must ? How can I use modal verbs: may might must ? I'd like to have some examples.

when can I use : will or going to ?

I'd like a good explain and some exemples.  Thanks.

Quero aprender English e ensinar Portuguese. Estou inscrita aqui com um único objetivo : estudar Inglês e ensinar Português. I am here in "Italk " just to study English and to teacher Portuguese. I don't want to get a boyfriend.