Meaning: This sentence describes the condition of the pool during the summer season, which is typically busy with swimmers.
Choice of Words:Crowded means full of people.
Alternative Expressions
The pool is full of people in the summer.
Meaning: This means that there are so many people in the pool when it is warm outside that there is no more room for anyone else. It is not a good time to go swimming if you don't like to be around a lot of people.
Choice of Words: The pool is the place where you swim. Full means that there is no more room for anything else. People are the ones who are swimming in the pool. Summer is the warmest season of the year. So, this sentence means that there are so many people in the pool when it is warm outside that there is no more room for anyone else.
It's hard to swim in the pool during summer because there are too many people.
Meaning: This means that it is difficult to swim in the pool when it is warm outside because there are too many people in the pool. It is not a good time to go swimming if you don't like to be around a lot of people.
Choice of Words: It's hard to do something when it is difficult or challenging. Swim is the activity that you do in the pool. Because means that something is the reason for something else. There are means that something exists. Too many means that there is more than enough of something. People are the ones who are swimming in the pool. Summer is the warmest season of the year. So, this sentence means that it is difficult to swim in the pool when it is warm outside because there are too many people in the pool.