He has two sons,1.and two of them are teachers.2.two of whom are teachers.为什么1.用them,2.用whom我的英语老师说：连接副,连接副,从缺主宾它不住这个好像是连接代词哎...再说了,哪里缺主语宾语了啊

1.A.The old man has two sons.Both of them are lawyers.B.The osd man has two sons,( ) ( ) ( )are lawyers.2.A.Have you heard of an animal called kangaroo?B.Have you heard of an animal( ) ( ) ( ) ( 1 .He has two sons.Both of 应该填whom还是who are teachers .2.He has two sons,both of 应填whom还是who are teachers. He has two sons,who in the same company He has two sons who in the same company这俩个句子有什么区别 He has two sons,who in the same company He has two sons who in the same company这俩个句子有什么区别 完形填空（迅速啊,急用）Bob is an old man.He has two big houses and a new car.He has ____1____ wife,but he is____2 father of four children.He has two sons and two daughters.One son is from England and the other son is from the USA.The two d 英语翻译He has two sons,___is a doctor,____is a teacher He has two sons,both of whom work as chemists.这里的as做什么成分? He has two sons.One son is a doctor .The other son is a teacher He has two sons, ( )of them lives with him. A .each B.neither C.either he has two sons and both are teachers这句话对吗? 英语翻译Bob Pearson is an old man.He has two big houses and a new car.He has no wife,but he is father of four children.He has two sons and two daughters.One son in from Eng land.His name is Bill.The other son is from America.His name is Mike.One Mr.White has two sons ,and each of them has a sister.how many childen does he have? 英语翻译Bob Pearson is an old man.He has a big house and a new car.He has no wife,but he is a father of four children.He has two sons and two daughters.One son is from England.His name is Bill.The other son is from America.His name is Mike.One of Alice has two sons.is Tim and is Tim.A.One,the other B.One,one C.He,he He has two sons,1.and two of them are teachers.2.two of whom are teachers.为什么are teachers是系表结构,什么是系表结构?teachers.不是感官动词啊? He has two sons,both of whom are teachers.和He has two sons both of them are teachers.第二句中没有and ,是不是对的?第一句的语法讲下, He has two sons,and ( ) are collage students.为什么能用both of them,and前后可以用两个主语么如果是he has two sons,___are college students.逗号前后只能有一个主语， He has two sons,both of whom are workers.此句中whom可以换成them吗?