Let me take a wild guess and say

I guess 我想 我认为 我猜

wild guess 大胆的猜想

take a wild guess 做一个大胆的猜想

1.Let me take a wild guess and say lily

2.I guess he did't see me.

3.I guess it requires some assembly.

require some assembly 需要组装一下

4.Can you do me a favor? My flowers require regular watering.

Do you require anything else?=Do you need anything else?