[B1/B2] Which is correct? (~to) - A little difficult? Message me for some help!

a Can you explain this word to me? 
b Can you explain me this word?

a I got angry with Mark. Afterwards, I apologised to him. 
b I got angry with Mark. Afterwards, I apologised him.

a Amy won't be able to help you. There's no point in asking to her. 
b Amy won't be able to help you. There's no point in asking her.

a I need somebody to explain me what I have to do. 
b I need somebody to explain to me what I have to do.

a They didn't understand the system, so I explained it to them. 
b They didn't understand the system, so I explained it them.

a I like to sit on the beach and listen to the sound of the sea. 
b I like to sit on the beach and listen the sound of the sea.

a I asked them to describe me exactly what happened.
b I asked them to describe to me exactly what happened.

a We'd better phone the restaurant to reserve a table.
b We'd better phone to the restaurant to reserve a table.

a It was a difficult question. I couldn't answer to it. 
b It was a difficult question. I couldn't answer it.

a I explained everybody the reasons for my decision. 
b I explained to everybody the reasons for my decision.

a I thanked everybody for all the help they had given me. 
b I thanked to everybody for all the help they had given me.

a Can you explain this word to me? b Can you explain me this word?