us study necessary to hard it’s for 连词成句

us study necessary to hard it’s for 连词成句 It is necessary for us to study math.中为什么要写us而不写we呢 t’s _______ for us to study English well.(need) It isn't necessary for us to know the causes of homeless什么意思? we havent settled the problem 什么什么 it is necessary for him to study abroadA,if Bwhere Cwhether Dthat lts necessary to study geography at school Parents don't need us to buy anything for them,but___(study) hard is enough his t is very important for us to study the ancient history 补全单词 We haven’t settled the question of whether it is necessary for him to study abroad.这个句子是什么从句?为什么whether前面要加一个of呢? We haven’t settled the question of _______ it is necessary for him to study abroad.为什么用whether不用if3Q~ we haven't settled the queasions of whether it is necessary for him to study abroad.把whether前面的of去掉作为同位语从句可以吗 The classroom is so dirty that we can't study in it.（保持原意）The classroom isn't ______ ______ for us to study in it. lt is necessary to study hard at school.同义句 lt's necessary for student to study hard同义转换 Don't be afraid ____(ask) for help. The boy is ____ in this ____book.(interest)It's necessary for us __(keep) heathy necessary 英语necessary的问题It is necessary for us to learn.可不可以改成We are necessary to learn Its necessary to study hard at school ( ) ( )study hard at school 同义句