Declarations of love
3Reserved for solemn moments: start of relationship, anniversary, proposal.
我爱你 I love you (strong declaration, use sparingly)
我爱上你了 I've fallen in love with you (上...了 marks the change of state)
你是我的一切 you are everything to me (very romantic)
Everyday "I like you"
3Lighter and more common than 我爱你 in Chinese couples.
我喜欢你 I like you (the ordinary declaration at the start of a relationship)
我喜欢上你了 I've grown fond of you (evolved into attachment)
我很喜欢你 I really like you a lot (很 reinforces)
Missing someone
3Often more used than pure declarations of love.
我想你 I miss you (想 = to think of, to miss)
我很想你 I miss you a lot (很 reinforces)
想死你了 I miss you like crazy (emotional hyperbole)