Elementary grammar exercise: present simple

English grammar practice exercise, beginner / elementary level.

This exercise gives you practice using the present simple tense. You will practise verb forms, questions and negatives.
Instructions: Use the words in brackets to complete the following:

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Structure of present simple
positive	negative	question
I work in a bank. You work in a bank. We work in a bank. They work in a bank.	I don't (do not) work. You don't (do not) work. We don't (do not) work. They don't (do not) work.	Do I work in a bank? Do you work in a bank? Do we work in a bank? Do they work in a bank?
He works in a bank. She works in a bank. The bank opens at 9 o'clock.	He doesn't (does not) work. She doesn't (does not) work. It doesn't (does not) open at 9 o'clock.	Does he work? Does she work? Does it open at 9 o'clock?

Present simple - common mistakes
Common mistakes	Correct version	Why?
I working in London.	I work in London.	The -ing form is not used in the present simple.
He work in London.	He works in London.	The third person he, she, it adds the letter s.
He work in London?	Does he work in London?	Questions - third person: does + subject + infinitive. All other persons: do + subject + infinitive.
Work he in London?	Does he work in London?
He not work in London.	He doesn't work in London.	Negatives - third person: subject + doesn't + infinitive. All other persons: subject + don't + infinitive.