“Oh, good thinking. That would be great.”
You're making plans with a friend to go to the park this weekend. She offers to bring some sandwiches. You tell her you think that's a great idea.
Oh, good thinking. That would be great.
"Oh" is a word that usually shows suprise. You use it when you find out some new information that you didn't expect:
Oh, you two know each other? I had no idea!
But in polite conversation, people sometimes use "Oh" in a subtle way. You can use it to appear surprised when someone does something nice for you. This makes you seem humble. For example, you can respond to a compliment using "Oh":
A: You're a good writer.
B: Oh, thank you!
Or if someone gives you a gift, you can seem surprised:
Oh, you got me something for my birthday? You shouldn't have! Thank you so much!
When someone has a good idea, you can tell them "good thinking":
A: Hey, why don't we take a break.
B: Good thinking.
This phrase sounds friendly. You can use it with coworkers or friends.
Use the phrase "that would be ___" to accept someone's offer. For example:
A: Would you like something to drink?
B: Sure, that would be great.
A: I can watch your kids for you if you'd like to go out for a few hours.
B: Really? That would be wonderful!
You can use a variety of words that mean "good", including "wonderful", "amazing", "lovely", "fantastic", "neat", and others.