請問台灣常常下很多雨 It的文法要怎麼寫?

It rains a lot in Taiwan.

it 是虛主詞,指"天氣".

It is used as the subject of a verb used to refer to a place called Taiwan that has already been mentioned or that is being talked about.
eg:-It(=Taiwan) rains a lot.
eg:-It's in the rain.
eg:-It(=Taiwan) often has a lot of rain-----(o)
eg:-It is often a lot of rain in Taiwan-------(?)

It often rains a lot in Taiwan.
# It(形式主詞 = “in Taiwan”) often(副詞，修飾 “rains”) rains(動詞) a lot(副詞，修飾“rains”) in Taiwan(地方副詞).
(#以下抄錄自辭典。)
# it：〔形式主詞・形式受詞〕例. It is hard living [to live] in that city.
# a lot：很多; 非常 例. A: Do you have any friends? B: Yes, I have a lot (of friends). 甲: 你有任何朋友嗎？ 乙: 有, 我有很多(朋友)。
# “a lot” 的用法： a lot 當副詞, 可與動詞, 形容詞或副詞比較級連用, 相當於a great deal, a good deal, quite a lot。, a lot 後面可以接of, 再接複數名詞, 表示很多。
# it：釋義3. （作無人稱動詞的主詞）表示時間氣候或距離等 例. It's early yet. 還早呢。 例. It's very hot. 天真熱。 釋義5. （作為形式上的主詞或受詞）用於表示強調的句型中 例. But here it's my word that counts. 但這裡是我說的話算數。

It always has heavy downpours in Taiwan. Yip