Ex. i. put the words in brackets into the correct form to make an accurate description of sizes of computers. there are different types of computer. the (large) and (powerful) are mainframe computers. minicomputers are (small) than mainframes but are still very powerful. microcomputers are small enough to sit on a desk. they are the (common) type of computer. they are usually (powerful) than minicomputers. portable computers are (small) than desktops. the (large) portable is a laptop. (small) portables, about the size of a piece of writing paper, are called notebook computers. subnotebooks are (small) than notebooks. you can hold the (small) computers in one hand. they are called handheld computers or palmtop computers.

There are different types of computer. The (largest) and (most powerful) are mainframe computers. Minicomputers are (smaller) than mainframes but are still very powerful. Microcomputers are small enough to sit on a desk. They are the (most common/the commonest) type of computer. They are usually (more powerful) than minicomputers.
Portable computers are (smaller) than desktops. The (largest) portable is a laptop. (Smaller) portables, about the size of a piece of writing paper, are called notebook computers. Subnotebooks are (smaller) than notebooks. You can hold the (smallest) computers in one hand. They are called handheld computers or palmtop computers.