Iii. .peter reads a bookbefore he goes to bed. computers process information with astonishing speed. 3.they work at the english language laboratorytwice a week. 4.students know grammarruleswell. 5.the oldcaroften breaks down.

Use who (preposition + whom), what, when, where, why, how, etc.

When a user wants to make a call, WHAT allocates an available frequency