Questions with who and what – Subject – Object

1. Subject questions

Question word Verb Rest Subject Verb Rest
Who runs to the shop? Peter runs to the shop.
What happened yesterday? A tragedy happened yesterday.

2. Object questions

Question word Auxiliary Subject Verb Rest Answer
Who do you like?   I like my mum.
Who did Mandy phone last Monday? Mandy phoned her uncle.
What does he read?   He reads detective stories.

Mind the difference in meaning in the following two questions:

Subject question Object question
Who phoned John? Who did John phone?