Is it true that Brits use this kind of term a lot?

[Porpolita]

lol where do you live? America.

Somewhere where the sun don't shine

[Mazik]

Somewhere where the sun don't shine

"Suburbia"

[Catkin]

I use the first 3 a lot! I shouldn't, it's not a very confident way to speak- it shows a bit of cautious hesitance (I think).

The last is not really something you'd hear. Maybe more "if I may say...", but that would be more from the older generations. I wouldn't say it.

[Virtuous]

I think

I suppose

I suspect

If I may

(Do Brits say like this when they start to begin the conversation mostly?)

Corrected.