Your help has been very valuable.看着象完成时`为什么没动词呢``

Your help has been very valuable.看着象完成时`为什么没动词呢`` Your help has been very valuable.help为什么不加s your advice is very valuable to me为什么be动词不是are? 英语句子改错 your advice has been of great valuable Has Been Very quiet Give your love has been Very 为什么现在完成进行时是have/has+been+动词进行时态 但是在“I have been Your life really has not been a very lonely是什么意思 Give your love has been very quiet丶如题 英语 完成时It has been raining for three hours.为什么要加been?加been不是表 that has been missing from your hand has been missng 是现在完成进行 Has been very quiet 英语完成时态的构成请问英语完成进行时态的构成为什么不是have,has加现在分词呢?为什么要加been呢?