わたしはよく映画へ行きます。or, could you put the sentence like this:
よく、わたしは映画へ行きます。
Time needs to come after the subject (わたしは), using よく there will be read as something different then a phrase expressing time.
わたしはよく映画に行きます instead of using "へ"
Yes, you could also use に in this sentence.
を shows that an action is done by something to something.
Example:
私は本を読みます (I read a book) - The book is the direct object of the verb(読む), therefore it read.
に can mean many things: to, for, in, at, etc. The sentence you posted means "I often go
to the movies". Using を wouldn't make sense. When you're not sure about which particle to use, think of what it would mean in English.
You rode
on/in the bus, therefore に must be used. This is also how it makes sense in English.
I'm not sure about this...I would also use に for this. With に it means "(It) walks
on the street".
Just for clarity, some examples of particle usage.
家に帰る - (It) returns home
家へ帰る - (It) returns home
車に乗りました - (It) rode
in the car
私友達に手紙を書きました - I
wrote a letter
to a friend.
六時に映画を見ました -
At 6'o clock I
saw a movie.
Those are the main ways the particle に is used. By expressing in, to, at, definite timem etc. You can also see the particle を being used for
verbs. Here are more examples of this particle:
サッカーをします - To play soccer
ファミコンをします - To play video games
日本語の勉強をします - To study Japanese
水を飲みます - To drink water
These are all action as you can see.
Hope I've been of some help.