اسأل سؤال

Good afternoon

"as soon as" is earlier than "when".

1-I'll call you as soon as I arrived home.

As soon as means immediately/ once

2-When I arrive home, I'll call you.

The meaning : when I arrive home I may  talk to my mother then call you

- used to is used with both state verbs ( e.g. love, miss, hate…..) and action verbs (e.g. go, play, travel…….).

- would is used with action verbs only.

A- must is used to express personal opinion/( obligation from the speaker).                                                                                           e.g.  

 I must do your homework.      (It is the opinion of the speaker)

B- have to is used to express external obligation. e.g.

student: I have to do my homework . (the obligation is from the teacher)

Have to is used for all rules not only  school rules 

 Ola