根据句子意思,用括号内所给的正确形式填空：1.Let the old man ( ) (get off) the bus first.2.We are going to( ) (plant) flowers in my garden.

let sb. do sth.
Let the old man get off the bus first.

be doing to do sth.
We are going to plant flowers in my garden.

1.get off let sb do sth
2.plant be going to do sth
都是固定搭配

1 get off
注；let sb do sth 固定用法‘让某人做某事.
2 plant
注：be going to do sth 固定用法‘ 打算做某事’