是不是一個(gè)句子中有了動(dòng)詞就不用be動(dòng)詞了呢?
--英語法語規(guī)定一個(gè)簡(jiǎn)單句里只能有一個(gè)謂語動(dòng)詞.但進(jìn)行時(shí)態(tài),都是由be+V-ing形式構(gòu)成.如:I am doing my homework now.am 是BE動(dòng)詞,而do是實(shí)義動(dòng)詞.
在特殊疑問句（沒有原陳述句的情況下選擇）是不是也是上面那個(gè)辦法,
--在疑問句里,語法規(guī)定要借有助動(dòng)語引導(dǎo)句子提問,有be動(dòng)語,情態(tài)動(dòng)詞(can,could,should would may...)在句中是,直接借用它們放在句首引導(dǎo)疑問句;沒有它們時(shí),借有do的相應(yīng)時(shí)態(tài)引導(dǎo)疑問句,并且謂語動(dòng)詞要改回原型.如 he finished his homework yesterday.改成疑問句:Did he finish his homework yesterday?出幾道題啊