Ответ:

- They love him/their son

They love him as if he was their son.

- You talk about him/an old man

You talk about him as if he was an old man.

- They met/good friends

They met as if they were a good friends.

- They ran/late

They ran as if they were late.

- You talk to me/a child

You talk to me as if I was a child.

- He looked at me/angry with me

He looked at me as if he was angry with me.

- She smiled at him/pleased with him

She smiled as at him as if she was pleased with him.

They love him as if he were their son.

You talk about him as if he were an old man.

They met as if they were(had been) good friends.

They ran as though(as if) it was (had been)late.

You talk to me as if I was a child

He looked at me as if he was(had been) angry with me.

She smiled at him as if he was pleased with him.