1. ถ้าประโยคอยู่ในโครงสร้าง It is +

1. If the sentence is in the structure It is + verb-ing indicate that the weather conditions are occurring.2. If the sentence is in the structure It is + adjective describing the weather.3. usually the y to the end of a noun to adjective is a Word to describe the weather that occurs.

1. If the sentence is structured It is + verb-ing that the weather was going on
two. If the sentence is structured It is + adjective describing the weather
three. Y will be added to the end of the noun to adjective is a word to describe the weather happens.

1. If the sentence is in structure It is verb-ing. So the weather that is happening
2. If the sentence is in the structure It is adjective. Describe the weather
3.Often has to fill y into the end of the word noun to change a word adjective "to describe the weather occurred.