It tell us to turn left (改为否定句) it tell us ___ ____ turn left.We must keep our school clean (改为一般疑问句)___we ____ our school clean?

It tell us to turn left (改为否定句) it tell us _not __ _to___ turn left.
We must keep our school clean (改为一般疑问句)
__Must_we _keep___ our school clean?

not to
tell sb. to do sth/ not to do sth.
Must keep
must 是情态动词，直接提前即可 另外情态动词后面用动词原形 所以是Keep
希望有用 呵呵。

not to
Must, keep

It tells us to turn left (改为否定句)
It tells us 【_not__ _to_】 turn left.
We must keep our school clean (改为一般疑问句)
【Must_】we 【keep】 our school clean?
祝你开心如意！O(∩_∩)O~~

It tell us to turn left (改为否定句)
it tell us _not__ __to__ turn left.
We must keep our school clean (改为一般疑问句)
_Must__we ___keep_ our school clean?

祝你快乐：）