​There is only a pencil in the stationery case.

一支笔 - a pencil

文具盒里 只有 一支笔

Brother draws a forest.

一片树林 - a forest

哥哥画了 一片树林.

The red sun is in the sky.

红色的太阳 - The red sun

天上有 红色的太阳.

I sent a flower to you, I hope you like it.

送你一朵花 - I sent a flower to you

送你一朵花, 希望你喜欢.

There is a row of big trees behind my house.

一排大树 - a row of big trees

我家后面有 一排大树.

I take a shower first and then eat.

先 - first / 再 - Then, Next

我先冲凉再吃饭.

Sky become cloudy. After that it's raining.

rán hòu - After that

天黑了, rán hòu 下雨了.