question: santander is a large spanish sea port and administrative center of cantabria region. the legend says the city received its name in honor of the roman legionnaire saint emiterium.
Capitalize this past sentence correctly.
A: Santander is a large Spanish sea port and administrative center of Cantabria region. The legend says the city received its name in honor of the Roman legionnaire Saint Emiterium.

question: wpdmtp.dll device can't work/no sound: actually, in most cases device problem is because of .sys files.
Capitalize this past sentence correctly.
A: WpdMtp.dll device can't work/No sound: Actually, in most cases device problem is because of .sys files.

question: just want to say thanks for the work you are doing. i’ve been doing this dance with lymphoma for 14 years now.
Capitalize this past sentence correctly.

A: Just want to say thanks for the work you are doing. I’ve been doing this dance with lymphoma for 14 years now.