Your suggestion will be rejected by the teacher. ✬

Your suggestion is of no practical use. ✬

Please feel free to make a suggestion. ✬

May I make a suggestion about it? ✬

Your suggestion seems reasonable. ✬

I'm all for your suggestion. ✬

We'll go along with your suggestion. ✬

My suggestion is for more trees to be planted along the streets. ✬

I'd like to point out some problems regarding your suggestion. ✬

I have a suggestion. ✬