is后边加not his school bag 是主语 is 系动词 on the desk介词短语作表语
His school bag is not on the desk.否定句就是在 系动词,助动词或情态动词后边加动词
如 I didn‘t go to school today.
is后边加not his school bag 是主语 is 系动词 on the desk介词短语作表语
His school bag is not on the desk.否定句就是在 系动词,助动词或情态动词后边加动词
如 I didn‘t go to school today.