Omitting relative pronouns and the use of "whom" in relative clause?

Question

When we write sentences related to relative clause, sometimes we omit the relative pronouns, for example: “He's a man that people like at first sight", we can change it to "He's a man people like at first sight". When should we omit the relative pronouns?

When should we use whom in the relative clause?

Answer 1

In formal or clear speech/writing, it is best to use these words, as they avoid misunderstandings. In informal speech/writing, they can be removed. By the way, the word whom is a relic of the past that is on its way out. Keep it or drop it, but certainly do not feel somehow superior to others for keeping it.

Answer 2

In English, you can almost always omit the relative pronoun, unless it refers to the main action of a clause instead of a noun, like this:

I lost my job, which made my father happy.

but this is clearly a different case than most relatives.

"whom" is used when the referent is the direct object of the verb or object of a preposition in the clause, such as:

This is the man whom I met last year. (I met him=whom)

He's the teacher in whom I put my confidence. (in + who = in whom)

Answer 3

It relies upon on whether the non-human creatures are named or prevalent. in case you had 2 cats which had distinctive colored ingesting bowls. "My cats have distinctive colored bowls. bill has a purple bowl and my different cat, whose bowl is blue, is named Ben."