“Wow, that’s really impressive.”
You work at an electronics store. While you're selling a computer to a customer, he tells you that he's a professional photographer and shoots a lot of major sporting events. That job seems difficult to get, so you respond with this.
Wow, that’s really impressive.
Also, "very" can only be used to modify an adjective:
It's very small.
I'm very tired.
"Really" can be used for adjectives as well as verbs:
It's really small.
I'm really tired.
I really wanted to go
Do you really think so?
"Wow!" expresses excitement. You say it when someone tells you something or shows you something. You can use "wow" to express a variety of emotions about the thing you're being told or shown:
- it's interesting and exciting
- you want to encourage the person, especially a child
- you can't think of anything else to say
"Impressive" describes an accomplishment that you think is good, which not many people are able to do. You say this to praise someone in a slightly formal way.
A: He built the whole thing himself.
B: Oh, wow. That's so impressive!
It's common to add words like "so", "truly" or "really" before "impressive":
That is truly impressive. I'm so proud of you.
You can also talk about "an impressive (something)":