行為動(dòng)詞的一般現(xiàn)在時(shí)和一般過(guò)去時(shí),變疑問(wèn)句和否定句時(shí),謂語(yǔ)動(dòng)詞要還原.如果就主語(yǔ)提問(wèn)時(shí),謂語(yǔ)動(dòng)詞不變.例如
1.He studies English hard.(變一般疑問(wèn)句和否定句)
Does he study English hard?
He doesn't study English hard.
He studies English hard.（就程度狀語(yǔ)問(wèn)句）
How does he study English?
He studies English hard.（就主語(yǔ)提問(wèn)時(shí)謂語(yǔ)動(dòng)詞不變）
Who studies English hard?
2.He did his homework at 4:00 in the afternoon.( (變一般疑問(wèn)句和否定句)
Did he do his homework at 4:00 in the afternoon?
did（助動(dòng)詞,無(wú)詞意）,do (謂語(yǔ)動(dòng)詞,做).
He did not do his homework at 4:00 in the afternoon.
第一個(gè)did是助動(dòng)詞無(wú)詞意,幫助do構(gòu)成否定句.第二個(gè)do是謂語(yǔ)動(dòng)詞必須還原.（時(shí)態(tài),人稱,數(shù)要求在助動(dòng)詞上體現(xiàn).）
He did his homework at 4:00 in the afternoon.（就時(shí)間狀語(yǔ)問(wèn)句）
When did he do his homework?（理由同上）
He did his homework at 4:00 in the afternoon.（就主語(yǔ)提問(wèn)時(shí)謂語(yǔ)動(dòng)詞不變）
Who did (謂語(yǔ)動(dòng)詞,做)his homework at 4:00 in the afternoon.