Subject verb agreement

English

What is the subject in this sentence? 'The cat chased the mouse.'

Which of these words is a subject? (A part that names)

Which word in the following sentence is a verb? 'The girl danced all night.'

Karen went to the shop and bought a book.

Karen went to the shop and bought a Book.

Karen went to the shop and Bought a book.

Karen went to the Shop and bought a book.

Which of these past tense verbs is incorrect?

Which of the following words should have a capital letter?