Several natural ways you can say “I agree with you” depending on formality and tone:

✅ Formal / Professional

I completely agree with you.

I share your opinion.

I’m in full agreement.

I couldn’t agree more.

That’s exactly my view.


✅ Neutral / Everyday English

Yes, I agree.

That’s right.

Exactly.

True.

I think so too.


✅ Informal / Conversational

Totally!

For sure.

Absolutely!

Yeah, you’re right.

Same here.

🔹 Ways to Say "I Think"

✅ Strong / Confident
(use when you’re sure about your point)
I argue that…
I contend that…
I maintain that…
I firmly believe…
I am convinced that…
There is no doubt that…

⚖️ Neutral / Balanced
(use in academic or polite discussion)
In my opinion…
I believe…
I am of the opinion that…
I would propose that…
I hold the view that…
It seems to me that…
From my perspective…
This suggests that…

🤔 Careful / Cautious
(use when you want to sound less direct or more open)
It appears that…
It could be argued that…
I am inclined to believe that…
I would suggest that…
It is reasonable to assume that…
As far as I can tell…
My impression is that…

🗨️ Casual / Everyday
(use in conversation, informal writing, or friendly talks)
I guess…
I figure…
I’d say…
Seems to me…
I feel like…
I reckon… (more UK/Australia)
To me…
Looks like…
My take is…
Honestly, I think…
If you ask me…

👉 This way, you can pick depending on the context:
Academic / formal writing → use “I contend that” or “It seems to me that”.
Conversation → use “I guess” or “Looks like”.
Strong claims → use “I am convinced that” or “There is no doubt that”.

intermediate-level common English phrases (a bit more advanced than the very basic ones). Here’s a list grouped by use:
Making Conversation
How have you been?
Long time no see.
What do you do for a living?
That sounds interesting.
I see what you mean.
To be honest…
As far as I know…
Polite & Professional
Would you mind if I…?
I’d appreciate it if…
Could you clarify that?
Sorry for the inconvenience.
I’ll get back to you soon.
Let’s keep in touch.

Daily Life & Social Situations
I’m not sure, but I think…
It depends on the situation.
I didn’t catch that, could you repeat?
That reminds me of…
I’ll take your word for it.
I’m looking forward to it.
Expressing Opinions
In my opinion…
From my point of view…
I guess you’re right.
I’m not so sure about that.
That’s a good point.
On the other hand…

Reacting Naturally
That makes sense.
You’ve got to be kidding!
I can’t believe it.
That’s not fair.
Sounds good to me.
I’m not in the mood.