I went there by bus.
I'll go there by bus.
I took a bus there.
I will take a bus there.
汉语和英语的语序有差别.但是意思应该是一样的.
注意英语表达习惯就可以了.
第二句
I went there to take a bus.to take a bus 是went there的目的.
I will go there to take a bus.