英语建议信常用句型包括：

I'd like to suggest that you can give me a prompt response.

May I suggest that you can…

I wish…

I really hope that…

What about… ？

I have learned that you have some trouble in learning English and I would like to give/ offer you the following suggestions.

You've asked me for advice with regard to helping others and I'll try to make some useful/ helpful/ practical suggestions here.

My advice is that you go and see the doctor right now.

In my personal opinion, it would be wise of you to take the following actions.

If I were you, I would try another method.

I am writing with my suggestion proposal about…

I am writing to express my views concerning…

It is time to take the advice of … and to put special emphasis on the improvement of …

in my opinion

from my perspective

it is advisable to...

had better （not） do

make a suggestion

take...into

这些句型可以帮助你更有效地表达你的建议，使你的建议信更加清晰、有说服力。