Hi Zachary. I hear people say, "I think..." quite often during conversations. You can also say, "I feel like..." or, "It seems like..." For example, "It seems like Angie wastes too much time talking on the phone." I hope this helped!

in native English, for casual speech we use I think very often, but if you are having an intellectual conversation with someone you would leave a better impersonation with "in my opinion"

"I think" is basically used to answer questions or interrogations when you are not really sure of the correct answer , and is just used to express your own opinion of what the answer or justification might be ... For example if you ask what time is it? I think its 4:00 PM ... Hope my answer helped

Hi Zachary! Also in casual communications you can use "as for me...".

we always use it cause it more casual and easy but you can say " in my opinion , i find that , it seems to me , i believe that " that is my perspective