用may can must 填空 You ---- come early. ------your friend speak English ,too? You ----- write these exercises. My mother ----- arrive tomorrow. I ----- see the park from the window . If I ----- say so ,I don't think you are very clever.
You must come early. Can your friend speak English ,too? You must write these exercises. My mother may arrive tomorrow. I can see the park from the window . If I must say so ,I don't think you are very clever.