English Grammar Tips : How to use of 'for' in grammar rules

Use of For in English Grammar Teacher:What is a school bag for? Micheal: A School bag is to carry books and notebooks. Teacher: What is a pen for? Micheal: A pen is to write with. Teacher: What is a blackboard for? Micheal: A blackboard is to write on. Teacher: What do we do with a piece of chalk? Micheal: We write on the blackboard with a piece of chalk. Teacher: What do we do with a duster? Micheal: We use duster to remove the writing on the blackboard. Teacher: What is a book for? Micheal: A book is to read. Teacher: What are the other things that we read? Micheal: We read newspaper, magazines, notebooks etc. Teacher: What is a glass for? Micheal: A glass is to drink water in. Teacher:What else do we drink in a glass? Micheal: We are also drink juice, milk, coffee, tea, milkshake etc. in a glass. Teacher: What is a watch for? Micheal: A watch is to look at time. Teacher: What is a comb for? Micheal: A comb is to set our hair with. Teacher: What are colour for? Micheal: Colour a...