I buy things.
subject + verb + object
我买东西。
Wǒ mǎi dōngxī.
I will buy some things tomorrow.
subject + time + verb + object
我明天买东西。
Wǒ míngtiān mǎi dōngxī.
I will buy things tomorrow (emph).
time + subject + verb + object
明天我买东西。
Míngtiān wǒ mǎi dōngxī.
I’m going shopping with my friends tomorrow.
subject + time + with who + verb + object
我明天跟我的朋友买东西。
Wǒ míngtiān gēn wǒ de péngyǒu mǎi dōngxī.
I’m going to the mall with my friends tomorrow to buy things.
subject + time + with who + go somewhere + verb + object
我明天跟我的朋友去商场买东西。
Wǒ míngtiān gēn wǒ de péngyǒu qù shāngchǎng mǎi dōngxī.
I’m going to a restaurant with my friends to eat Chinese food tomorrow.
subject + time + with who + go somewhere + verb + object
我明天跟我的朋友去饭店吃中国菜。
Wǒ míngtiān gēn wǒ de péngyǒu qù fàndiàn chī zhōngguó cài.