Expressing "together" with 一起 and 一块儿
一起 and 一块儿 have the same meaning, but differ slightly in usage.
The adverbs 一起 
and 一块儿 have the same meaning "together".
In a sentence, the adverbs 一起 and 一块儿 are placed before a predicate.
and 一块儿 have the same meaning "together".
In a sentence, the adverbs 一起 and 一块儿 are placed before a predicate. Pay attention
一块儿 is only used in spoken language.
Scheme
subject
一块儿/一起
predicate
Examples
咱们一起去跳舞吧
Let's go dancing together
zánmen yìqǐ qù tiàowǔ ba
These adverbs are often used with the prepositions 和 and 跟 to convey the meaning "together with someone".
and 跟 to convey the meaning "together with someone".Scheme
subject 1
和/跟
subject 2
一块儿/一起
predicate
Examples
你怎么不跟他一块儿去？
Why don't you go with him?
nǐ zěnme bù gēn tā yíkuàir qù
我没有和她一起吃饭
I didn't have lunch with her
wǒ méiyǒu hé tā yìqǐ chīfàn
If the predicate is followed by 在 , 一起 is placed after the predicate.
, 一起 is placed after the predicate.For example:
住在一起
生活在一起
放在一起
生活在一起
放在一起 Examples
把你的行李跟我们放在一起
Put your suitcase next to ours
bǎ nǐ de xínglǐ gēn wǒmen fàng zài yìqǐ
你跟谁住在一起？
Who do you live with?
nǐ gēn shéi zhù zài yìqǐ
在一起 also means "to be in a relationship”.
Examples
我现在跟小明在一起
I'm in a relationship with Xiaoming
wǒ xiànzài gēn xiǎomíng zài yìqǐ
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