Hammer and nails are both the subject of that sentence.
I need a hammer to tighten the nails on my chair.
If I had a hammer, I would hammer in the morning. I need to hammer the loose nails back in. There are some concerns with the contract that we need to hammer out.
The part of a hammer that uses leverage to remove nails is the 'claw', usually located on the back of the hammer. The 'face' is the front of the hammer used to drive nails.
claw hammer
Erm... To hammer nails?
Erm... To hammer nails?
A hammer or a claw hammer, the 'claw' is used to pull out unwanted or bent nails.
A claw hammer is a tool primarily used for pounding nails into, or extracting nails from, some other object.
Hammer nails or pull nails.
hammer ?
In passive voice, the sentence "The hammer might have struck him" is transformed by making the object of the active sentence (him) the subject of the passive sentence, using the appropriate form of the verb "to be" (in this case, "been") and the past participle of the main verb (struck). The modified sentence in passive voice is: "He might have been struck by the hammer." In this passive construction, the emphasis is on the receiver of the action (him), rather than the doer of the action (the hammer). The subject of the passive sentence (him) is now affected by the action of being struck by the hammer.
The part of the hammer that removes nails is a lever, specifically a claw hammer. The claw hammer has a curved, forked end that acts as a lever to help pry out nails. When the hammer is pushed down against the wood, the claw helps to lift the nail up and out.