science和scientific,chemistry和chemical修饰名词时用法的不同点?

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• cost和costs的用法区别什么时候用cost,什么时候用costs?比如说前面修饰的是不可数名词或可数名词时的差别,还有过去式怎么分别?练习书上Sally spent 200 yuan on this new handbag.改后的句子为This new handbag cost Sally 200 yuan.此处用cost是不是因为是过去式呢?如果不是过去式是不是用costs?
• science和scientific,chemistry和chemical修饰名词时用法的不同点?
• which 和 what 在从句中的用法1.Output is now six times what it was before liberation.2.They are so alike that you can't tell which is which. 想请教一下为什么这么用?不是说what用在名词从句里,而which单独时用在形容词不是说what用在名词从句,which单独时用在形容词从句吗?第一句为什么不是‘which it was before liberation’ 来修饰times,做形容词从句?第二句为什么不是‘what is which ’做tell的宾语从句,which能做从句的主语吗?不是what才能做从句的主语吗?
• science和scientific,chemistry和chemical修饰名词时用法的不同点?
• many more和much more仅仅是可数和不可数的区别吗?There are many more trees in a few years ago in the world.句中的many more我认为many是作为副词,但是字典上却没有many作为副词的用法,而I ate much more meat than you.中much是作为副词修饰吧?我明白了,much more后跟形容词或副词时，more是比较级，如more beautiful，much是程度副词，而much more加不可数名词时much是形容词，more是比较级much more water即 more much water更多的水，many more加可数名词同理
• 1.完成对话(一空一词）：Are they in the box?Oh!They aren't ( )2.完成对话(一空一词）：It's five o'clock in the afternooon,Tommy wants( )basketball.(plays/to play/play)3.完成对话(一空一词）：I( )a new bike ,but my sister ( )第3题填写“我没有新自行车，但我姐姐有。”选项有：don't have ;does.not have;does.另外再问一道题哈：为什麽look an this photo。要用an呢？
• 一道英语选择题（关于：why 的用法的..we are going camping.why ( ) with us?A:don't come B:not you comeC:not come D:not