question: the product gives an excellent shine and silky softness to mane and tail, for many days. it keeps the hair tangle-free and repels dirt thus helping to keep the coat clean.
Capitalize this past sentence correctly.
A: The product gives an excellent shine and silky softness to mane and tail, for many days. It keeps the hair tangle-free and repels dirt thus helping to keep the coat clean.

question: do not forget to rate the video! if you liked the video or not. thank you!
Capitalize this past sentence correctly.
A: Do not forget to rate the video! If You liked the video or not. Thank you!

question: i had left church and sunday school when i was eighteen.
Capitalize this past sentence correctly.
A: I had left church and Sunday school when I was eighteen.