1) Letters: a printed communication
Example sentences: 1) I get letters from my relatives monthly.
2) The letters were scented.
2) Always: at all times
Example sentences: 1) I always do my homework on time.
2) He always comes on time.
3) Never: at no time
Example sentences: 1) I never lie to my parents.
2) I never dance in front of my friends.
4) Though: but
Example sentences: 1) I passed in exam, though not scored much.
2) He came to class, though he wasn't well.