sweet

Grapes are sweet, that's why I like them.

A 'sweet' food either has a lot of sugar or tastes like it has a lot of sugar.  For example, cookies, cakes and soda are sweet.  Notice the following:

1. This cookie is a little too sweet.
   
2. He likes to eat something sweet in the afternoon.
   

hometown

Are there many grapes around your hometown?

The place where a person is born or lives for most of his childhood is a 'hometown.'  Notice the following:

1. How long did you live in your hometown?
   
2. We visited Michael Jackson's hometown.
   

season

My favorite season is winter.

A 'season' is one of the four periods of the year.  There is winter, spring, summer and fall.  Notice the following:

1. What is your favorite season?
   
2. I prefer summer because it is the season with the longest days.
   

cool

You like the cool, cool weather.

'Cool' weather is a little bit warmer than cold weather.  In cool weather you would be comfortable in jeans and a light jacket.  Notice the following:

1. Can you please put this soup in the microwave, it's a little cool.
   
2. It was a little cool this morning, but now the weather is perfect.
   

opposite

I'm the opposite. I like warm weather.

The 'opposite' of something is its contrary.  Hot is the opposite of cold, fast is the opposite of slow, up is the opposite of down, etc.  Notice the following:

1. We are opposites in almost every way.
   
2. He always does the opposite of whatever you tell him.