he spends an hour practicting speaking English为什么practice加ing

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• he spends an hour practicting speaking English为什么practice加ing
• 1,does he have to practice speaking english every day.为什么speak要加ing?2,我不得不在六点以前到家
• he spends an hour practicting speaking English为什么practice加ing
• 1,does he have to practice speaking english every day.为什么speak要加ing?2,我不得不在六点以前到家i have to get home by 6 o'clock"以前”为什么没有before这个单词?为什么用by不用at?3,we had fun riding our bikes to the beach today为什么rid要加Ing?
• He practises speaking English every day.他每天练习说英语中的speaking为什么speak后加ing 根据一般动词的现在式的结构可知道这种句子结构应该是 主语+动词的第三人称单数形势+其它.啊貌似speaking是个进行时啊,而这个句子是现在时啊,还有这些句子也让我费解？比如He practised speaking English yesterday .He will practising speaking English tomorrow.等等中的为什么也用speaking..........请你们谁详细的解说下这3个句子？
• excuse me.do you have any books about___ moon?yes,they are on ___ shelf over there.
• 甲乙两车在AB两城间连续往返行驶,两车在途中分别距离200千米和240千米的C处第一次相遇.