@cherypiew Normally, 'I appreciate' isn't used in the present tense. It is usually used as, "I would appreciate it if you..." Appreciate does have the same meaning as 'thank you', but is generally used in different situations.
'Suppose' is just a synonym for 'guess'.
The sentences, "I suppose I'd like that." and "I guess I'd like that." both are the same.
Hope I cleared up some things. <3