Meaning of yī qǐ:
一起
(in) the same place; together; in company (with); altogether; in total
Wǒmen kěyǐ míngtiān yīqǐ qù kàn diànyǐng ma?
我们可以明天一起去看电影吗?
Can we go watch a movie together tomorrow?
Wǒmen yīqǐ qù kàn diànyǐng ba.
我们一起去看电影吧。
Let's go watch a movie together.
Wǒmen kěyǐ yīqǐ qù kàn diànyǐng.
我们可以一起去看电影。
We can go to the movies together.
an instance of; a case of (murder, accident, dispute etc)
Zhè qǐ chēhuò zàochéng le jiāotōng dǔsè.
这起车祸造成了交通堵塞。
This car accident caused a traffic jam.