1. He saw most of the boys.
2. He saw most of his boys.
3. He saw most of these boys.
4. He saw most of some boys.
5. He saw most of ____ boys.
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Q1: Are the sentences all grammatical?
What about #4? Can we use #4?
Q2: What other words can be put in the blank in #5?
Q3: What is the meaning of 'boys' in #2? Do 'boys' mean 'sons'?
All the sentences are fine. You'd use #4 if you were answering a question about a group of boys that had already been pointed out to you and they are close to you. In #5, you could use "those boys" if answering a question about a group of boys that was farther away from you, but still within sight.
A1: Yes, all of the sentences are grammatically correct.
Regarding #4, it is grammatically correct, but the phrase "most of some boys" may not be semantically coherent. The phrase suggests that there are multiple groups of boys, and out of those groups, the person saw the majority of one particular group. However, without specific context, it may be more common to use phrases such as "some of the boys" or "a few of the boys" instead of "most of some boys."
A2: In sentence #5, the blank can be filled with any word that appropriately describes or specifies the boys being referred to. For example, you could use words like "my," "their," "those," "our," or any other possessive determiner that indicates the specific group of boys you are referring to. For instance, "He saw most of our boys" or "He saw most of their boys."
A3: In sentence #2, the word "boys" does not necessarily mean "sons." It can be interpreted as a general term to refer to young males. While it could include sons, it can also include other young males who may not necessarily be related to the subject. The meaning of "boys" would depend on the context in which it is used.