H. We do not use will in the when ~ part of the sentence (e.g. We'll go out when it stops raining. (not when it will stop)
a. The same thing happens after while/ before/ after/ as soon as/ until or till. (e.g. I'm going to read a lot while I'm on holiday. (not while I will be)
H1. can also use the present perfect (have done) after when/ after/ until/ as soon as. (e.g. Can I borrow that book when you've finished with it?)
a. If you use the present perfect, one thing must be complete before the other (so the two things do not happen together) (e.g. When I've phoned Kate, we can have dinner. (First I'll phone Kate and after that we can have dinner))
b. Do not use the present perfect if the two things happen together. (e.g. When I phone Kate, I'll ask her about the party. (not When I've phoned))
c. It is often possible to use: I'll come as soon as I finish. or I'll come as soon as I've finished.
H2. We use when for things which are sure to happen. (e.g. I'm going shopping later. (for sure) When I go shopping, I'll buy some food.
Idiom 365
Felt as if my head was going round: feeling dizzy
Example: I suddenly felt as if my head was going round with excitement as I will collect the award.