Common Meanings
1
sì似
Similar to; like; resembling.
她的笑容和她的母亲非常相似。
Her smile is very similar to her mother's.
To seem like, as if; indicating uncertainty or a guess.
他似有心事，一直沉默不语
He seems to have something on his mind, remaining silent all the time.
To indicate comparison or a sense of surpassing, suggesting that one thing is like or better than another in a progressive manner, similar to 'one taller than the other'.
她的病情一天好似一天。
Her condition is getting better day by day.
2
shì似
Used as a particle 'shìde' to indicate similarity, meaning 'like' or 'similar to (something)'. It usually follows a noun phrase or a descriptive clause.
他高兴得跟个孩子似的，一点儿烦恼都没有
He was as happy as a child, without a trace of worry.