雨是怎么形成的,用英文解释4到5个句子,太深奥的不需要,谢谢大家了~~急求~~~

1,Rain is formed when water molecules in the air collect around particles of dust.
雨是由于空气的水分子聚集在灰尘的四周而形成的.
2,The water evaporated to form clouds. These rose ihto the sky to form rain.
水蒸发形成云,云上升到空中形成雨.
3, water vapor could be much less likely to turn to rain without the dust particles.
假如没有灰尘的微粒,水蒸气就不大可能形成雨.
4,When the collected water becomes heavy enough the water droplet falls to the earth as rain.
水气凝结到一定程度就形成了小水滴,其重量足以使它落到地上,即为雨.