He couldn't understand spoke English before he moved to Canada.为什么speak和move用过去时?一句话中不是只有谓语动词表现时态就可以了么?为什么speak和move都要用过去时?

He couldn't play with candles.I couldn't e . He couldn't tell the season翻译 翻译:He couldn't fall asleep He couldn't talk with nobody Seeing it ,he couldn't help___(shout) He said that he couldn't solve the problem.翻译 Once he d___,he couldn't change his mind he was ___tired ____ he couldn't go on working he said he couldn't listen to me 改错 Angry as he was,he couldn't help saying so angry as he was,he couldn't saying so. He couldn't play anythings 的同义句 He ___play____. He tried ____(catch)the cat,but he couldn't He said he couldn't _______(背叛)his country though he was angry,he couldn't help 改为同义句 ＿＿he was,he couldn't help smiling 英语翻译Tom was （）he couldn't say a word He couldn't answer the question correctly 改为同义句 we never told him he couldn't do it翻译