我和我的同事一起午餐。
wǒ hé wǒde tóngshì yīqǐ wǔcān 。
My colleague and I have lunch together.
他是我的好同事，我们一起工作了五年。
tāshì wǒde hǎo tóngshì ， wǒmen yīqǐ gōngzuò le wǔnián 。
He is my good colleague, we have worked together for five years.
我最近认识了很多新同事。
wǒ zuìjìn rènshi le hěnduō xīn tóngshì 。
I have recently met many new colleagues.