How do you say

I’m planning to buy a new sofa within three months.

..in Chinese?

我打算在三个月内买一套新沙发。

wǒ dǎ suàn zài sān gè yuè nèi mǎi yī tào xīn shā fā 。

How do you say "We’re planning a trip for next month. I hope you can join us." in Chinese?