Question

帮我分析一下这个句子成分

And what we know is that they express a certain type of host genetics that dictate that they target very critical regions of the virus.

Answer 1

What we know 主语从句，is谓语动词，属于系动词，that they express a certain type of host genetics表语从句。that dictate that they target very critical regions of the virus.第一个that一直到virus是定语从句，修饰前面的a certain type.第二个that到virus是宾语从句，做的是indicate的宾语。

Answer 2

what we know 是主语从句做主语，is that 是表语从句。they express a certain type of host genetics that dictate that they target very critical regions of the virus.是表语从句。
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Answer 3

And what we know(主语) is（谓语） that they express a certain type of host genetics that dictate that they target very critical regions of the virus。is之后的that领导宾语从句，宾语从句里面完整的句子为they express a certain type of host genetics,之后的that领导一个定语从句，host genetics 作从句主语，dictate作从句谓语，后面是一个that领导的宾语从句作定语从句的宾语。

Answer 4

1、“what we know”是整个句子的主语，what 在这里引导一个主语从句。其中 “that they express a certain type of host genetics that dictate that they target very critical regions of the virus”这个句子是整个主语从句的宾语。
2、这里“host genetics that dictate…..”这句话的that 在从句里是引导一个定语从句，修饰host genetics ,先行词也是host genetics.
3、“dictate that…”这个that 在从句里是引导一个宾语从句，“that they target very critical regions of the virus”这句话都是dictate 的宾语。
请参考。

Answer 5

分层解析如下：

（And ）what we know（主语从句） is （that引导的宾语从句）that they express a certain type of host genetics that dictate that they target very critical regions of the virus.

宾语从句（that ）they express a certain type of host genetics（that引导的定语从句，等于which） that dictate（that引导的宾语从句） that they target very critical regions of the virus.