He has slept off.❌
My dad has slept off❌

Why are these two expressions wrong?

They are wrong because the phrasal verb 'sleep off' is transitive , but it has been used as an intransitive verb.

A transitive verb always require an object. When somebody sleeps off, one need to ask....what exactly did he sleep off?

Sleep off is a transitive verb which means to sleep until you do not feel I'll anymore , respect after drinking too much alcohol. E.g. He needs to sleep off the effect of last night's party.

You can actually say

My dad has gone to sleep✔
My dad has fallen asleep✔
My dad has drifted off to sleep✔

If you want to imply that somebody fell asleep without intending to, you could say they nodded off.

'Nod off' is an intransitive phrases verb which means 'to begin to sleep when you do not intend to. E.g.
The young man nodded off while we were still seeing the horror film.

Honestly, there are a lot of errors in our spoken English, some of these errors can mar your write-up.

Those who are gonna sit IELTS pleas do take note. This is one of the reasons a lot of people will advice that you reduce the use of phrases verbs and idioms when sitting IELTS. You might not know when something you said could be interpreted differently or be viewed as incomplete or inadequate just like the verb 'sleep off' in the sentence 'my dad has slept off'.


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https://www.youtube.com/watch?v=XdbGUTYG6j8

This also means the sentence " My dad has slept off" can be identified as pidgin.

Pidgin English is the best.

Very funny. I hardly hear people say that in pidgin. They usually say that when they speak the English language

alphaNomega:
This also means the sentence " My dad has slept off" can be identified as pidgin.

Pidgin English is the best.