今晚有空吗？
Are you free tonight?

Explain:
今晚 tonight
有空 free
吗 (a particle used at the end of questions)
Notes:
“今晚有空吗？” means “Are you free tonight?” In colloquial Chinese, people often use this phrase to politely ask someone to come to a party, a wedding, a meal etc. You may say this to ask someone if he would like to come with you when you are going somewhere tonight.

一起吃饭吧!
Would you like to have dinner with me?
Explain:
一起 together
吃饭 eat/ have dinner
吧 [ (used at the end of a sentence) indicating entreaty, suggestion, command, etc.]
Notes:
“一起吃饭吧！” means “Would you like to have dinner with me?” This is a common everyday invitation. It is usually used between acquaintances, friends, colleagues or anyone you're familiar with when you ask them if they’d like to come with you for a meal.

您能来吗？
Could you come?
Explain:
您 you
能 can/could
来 come
吗 (a particle used at the end of questions)
Notes:
“您能来吗？” means “Could you come?” The speaker uses the sentence to politely invite someone respected, such as the elder, superior etc., to come with him to a party or dinner.

请进。
Please come m
Explain:
请 please
进 come m
Notes:
“请进。” means " Come in, please.” It’s a common everyday phrase, usually used to politely ask someone to enter your room, house or office etc.

请坐。
Sit down, please.
Explain:
请 please
坐 sit/sit down
Notes:
“请坐。” means “Sit down, please.” This is an everyday Chinese phrase frequently used to express your kindness to someone and politely ask someone to sit down or help himself to sit down after he enters your room? house or office etc.

我请客!
It’s my treat!
Explain:
我 I
请客 treat/feast
Notes:
“我请客！” means “It’s my treat!” This is a common Chinese phrase that is used to surely tell someone that you will pay for something such as a meal, a film or even a travel for him when inviting him out to a meal, a film or a travel etc.

我等你。
I'll wait for you.
Explain:
我 I
等 wait for
你 you
Notes:
“我等你。” means “I’ll wait for you.” It is used when the speaker tells someone that he is sure to stay somewhere until someone arrives.

什么时候？
When?
Explain:
什么 what
时候 time
Notes:
“什么时候？” means “When?” and is a typical inquiry about time. When you ask the time of an appointment or something else, you can use this sentence without hesitation.

地点呢？
Where?
Explain:
地点 place/site
呢 (used to ask questions for purposes of emphasis)
Notes:
“地点呢？” means “Where?” This sentence is usually asked together with the preceding sentence “什么时候? ” when you have an appointment with someone.

六点，长城饭店门口见。
See you at the gate of the Great Wall Hotel at 6 o'clock.
Explain:
六点 6 o’clock
长城饭店 the Great Wall Hotel
门口 gate
见 see/ meet
Notes:
“六点，长城饭店门口见。” means “See you at the gate of the Great Wall Hotel at 6 o’clock.” This sentence is as an example of replying to two preceding questions, “什么时候?” and “地点呢？”