similar  - similar, parecido, semejante 

alike  - igual, semejante, parecido 

to seem  - parecer 

to look  - mirar, buscar, parecer 

to appear to be

to think  - pensar, razonar, considerar, creer, opinar, reflexionar, ocurrirse, concebir 

to have an opinion

to like  - agradar, gustarle (algo a uno), querer, desear 

to be in agreement