father：父亲，属于名词，可以做主语，凡是貝有名词性质的都可以作主语
例如：
Father is mother‘s er Donovan dropped his eyes.多诺万神父垂下了眼神
His father flew out to see him in hospital.
他的父亲从远方乘飞机到医院来看他。
1单数名词、不可数名词、不定式、动名词或从句都可以作主语。
如：
His father is working on the farm.
Time is money.
To finish all the work on time is impossible.
Reading in the sun is bad for your eyes.
The children are in the classroom 2 hours ago.
1，由what 引导的主语从句充当主语：
如：
What I bought were 3 English books.
What I say and do are helpful to you.
2、由and 或 连接起来的合成主语：
Lucy and Lily are twins.
She and I are friends.
Both she and he are Young Pioneers
