A sentence starts with a capital letter for example:
The rain poured and poured down.
It always starts with a capital and end with a full stop
Yes, you can start a sentence with "For example, the study examined the impact of social media on consumer behavior."
however
A scentence for unlikely is: He has a good reputation for being a liar, so it is unlikely he is telling the truth this time.
Maybe because, what if the word also is the first word of the scentence. You also don't use it when you have a scentence like: I also like bananas and strawberries. What I mean is, is that it depends on the scentence.
its Thirty-fifth if in the middle of a scentence and it's Thirty-Fifths if it's the beggining of a scentence
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a sentence is a long word thingy
I talked earnestly.
You don't.
Scientists have split the atom.
The invention of the wheel was a revolution.
we all had a separate alcove