a lot of useful advice后面是用is还是用are？ a piece of useful advice

a lot of useful advice\u540e\u9762\u662f\u7528is\u8fd8\u662f\u7528aa\uff1f

advice\u672c\u4eba\u65e2\u662f\u53ef\u6570\u540d\u8bcd(\u901a\u544a\u7b49)\uff0c\u4e5f\u53ef\u4ee5\u662f\u4e0d\u53ef\u6570\u540d\u8bcd(\u5efa\u8bae\uff0c\u5fe0\u544a\u7b49\uff0c\u8fd9\u4e2a\u6bd4\u8f83\u5e38\u7528)\u3002
a lot of \u4fee\u9970\u7684\u540d\u8bcd\u540e\u63a5\u8c13\u8bed\u6216\u8005be\u52a8\u8bcd\u7684\u5f62\u5f0f\uff0c\u7531\u4fee\u9970\u7684\u540d\u8bcd\u7684\u5f62\u5f0f\u51b3\u5b9a\u3002
\u6240\u4ee5advice\u5728\u8fd9\u6ca1\u52a0s,\u6240\u4ee5\u662f\u4e0d\u53ef\u6570\u540d\u8bcd\uff0c\u6240\u4ee5\u540e\u9762\u8c13\u8bed\u6216\u8005be\u7528\u5355\u6570,\u8fd9\u91cc\u7528is.

a piece of useful advice \u5bf9
\u56e0\u4e3auseful \u662f\u5f62\u5bb9\u8bcd,advice\u662f\u540d\u8bcd,\u5f62\u5bb9\u8bcd\u52a0\u540d\u8bcd\u5c31\u7ec4\u6210\u4e86\u4e00\u540d\u8bcd\u77ed\u8bed
a piece of \u4f60\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u56fa\u5b9a\u7684\u77ed\u8bed,\u4e5f\u53ef\u4ee5\u770b\u6210 \u51a0\u8bcd+\u540d\u8bcd+of ,
a kind of \u4e00\u4e2a \u79cd\u7c7b \u7684

a lot of useful advice 后面用is。
汉意：许多有用的建议
advice 不可数名词，建议
advice 作主语时，谓语动词用单数形式。如：His advice is good.

当然是用is,因为advice是不可数名词
如
A lot of useful advice is given to him.

后面用is。因为advice是不可数名词，所以要用is。

advice不可数用谓语动词用单数。

扩展阅读：a few alot of ... the man loves nature ... the classroom was silent ... a lot of fun是什么意思 ... an eye for eye ... the church tower which ... a lot of funny还是fun ... i am all eyes ... all the way ...