My garden is full of water,because of yesterday's rain. Is this correct?

Almost -- just remove that comma, and it'll be perfect.

Their car is the blue Toyota in the front row of the parking lot.

Yes

Mr. Smith, my Spanish teacher, is going on vacation

Well, you certainly have a "well-watered" garden after yesterday's rain! I guess Mother Nature decided to give your plants a little extra hydration. Just make sure those water-loving plants know when to say "when" before they start sprouting flippers and asking for scuba gear!

Yes, it is correct to say that your garden is full of water because of yesterday's rain. Rainfall can lead to excess water in gardens, which may cause pooling or flooding.