Let us go to the supermarket.同义句（）（）going to the supermarket?

Let us go to the supermarket.同义句（）（）going to the supermarket?
Let us go to the supermarket.
同义句
（）（）going to the supermarket?

Let us go to the supermarket.同义句（）（）going to the supermarket?
（They）（are）going to the supermarket?
（we）（are）going to the supermarket?
（You）（are）going to the supermarket?
（I）（am）going to the supermarket?
（she\he）（is）going to the supermarket?
（My father\mother\friend）（is）going to the supermarket?
（Mary\Sam）（is）going to the supermarket?
"shall"是情态动词,所以它后面的词语不能加ing!因此“（shall）（we）going to the supermarket?”不成立!

（shall）（we）going to the supermarket?

(I) (AM) going to the supermarket

Why not

填 Shall we