this,yours,keys,set,is,of,the,lost,in,and,found,case（?）连词成句

I lost a set of keys.然后是用 Is this yours?还是Are these yours? this,yours,keys,set,is,of,the,lost,in,and,found,case（?）连词成句 You use this set of keys for Here is （）?Are these yours.A.a set ofHere is （）?Are these yours.A.a set of keys B.a set of keysC.the keys D.keys填什么 ,为什么 （Is） the set of keys yours?为什么用Is 不用Are? found:a set of keys Are these yours call jenny at 284-5486.换种方法怎么写 是where is a set of keys 还是where are 回答是It‘s 还是They're是Is this a set of keys 还是 Are they a set of keys This is a set( )keys用介词in,on,under,of,for 今天老师跟我们说a set of keys后面用is,后来我们读了一篇短文是这样的：Found:A set of keys.Are these yours?那为什么这里用Are these呢? 括号中的词适当形式填空.（1）What's this?It's ___L'.(a) (2)five and three___seven.(be)(3)What's his ___first name?(friend) (4)how ___your parents?(be) here ____a set of keys.Are they yours?(be) this is换he/she is,a set of keys换keys可以吗?为什么a set of keys是复数,下面一句却是is this your set of keys.is不是单数用的吗?什么情况下用at?什么情况下要换第三人称形式?什么单词前面要加the?什么情况 This is my dictionary.(改为一般疑问句 set to that a of is keys room her （连词成句） That is her watchHow do you spell it?Is this your computer?No,it isn's a set of keys. This set of keys ( ) in ( ) schoolbagA.is;he B.are;his C.is;my D.are;i We can use _____ keys for ______.A.this,type B.this piece of ,type C.this list of,typing D.this set of,typing this set I lost two ____(set)of keys a set of keys英汉互译