you have to get a green book "the Book of mudora" found on top of a shelf towards the bottom of the village in the library. you run into the shelf and the book falls. then you must take the book to the three rocks in the desert and press the start button. then select the book and use it. then the rocks will move for you. this is alo how you get bombos and ether (i believe)
the hookshot is in the swamp palace.
You need to beat both Link to the Past and Four Sword.
In the Dark World the Palace of Darkness is in the same area that the 1st dungeon was in. You will need 110 rupees to enter the temple, 10 for the monkey to follow you, and 100 for him to open it for you (it's not possible to open it yourself).
The past tense of enter is entered.
Jump to each of the rocks when it is lower, even if you can't see it. For the 5th and 6th rocks, jump when both are moving quickly downward. At the top, jump left onto the volcano and enter.
The past tense of enter is entered.
The past perfect tense of enter is had entered.
Pay the monkey
The item you need from the Dark Palace is the Hammer, which you require to beat the game.
Enter is a regular verb so past and past participle are both verb + ed = entered
You can't go back to the past.
no entered is past tense