Do pendulums count as spells in the grave?

While in a Pendulum Zone, a Pendulum Monster is treated as a Spell and not as a monster. If a Pendulum Monster would be sent from the field to the Graveyard (either as a Monster Card or Spell Card, and even if it is face-down), it is placed face-up in the Extra Deck instead.

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In respect to this, can you pendulum summon normal monsters?

Pendulum Monster Cards can be Summoned like regular monsters in your Monster Zones, or activated as Spell Cards in your Pendulum Zones. You can declare a Pendulum Summon once per turn during one of your Main Phases, much like how you can Normal Summon or Set a monster once per turn during one of your Main Phases. What is an XYZ monster? Xyz Monsters are a new type of monster with a black frame. Xyz Monsters don't have a Level. Instead they have a Rank, which is displayed on the opposite side of the card to where the Level Stars would be. The Rank of an Xyz Monster gives a clue as to how to Summon it.

What happens if you Tribute a pendulum monster?

"When a Pendulum Monster (even if it is face-down) would be sent from the field to the Graveyard, either as a Monster Card or Spell Card, it is placed face-up in the Extra Deck Zone instead. What are pendulum monsters? Pendulum Monster Cards are a new kind of card that blurs the line between Monsters and Spells! They can be Summoned as monsters to attack or defend, or you can activate them as Spell Cards in your Pendulum Zones to activate extra special abilities and allow you to Pendulum Summon.

Can Mystical Space Typhoon destroy pendulum monsters?

Cards like Solemn Warning or Mystical Space Typhoon are the perfect axe to chop down your opponent's strategy. Since the cards in the pendulum zones are considered spell cards, then mystical space typhoon can take them out. You can also ask do you have to tribute to pendulum summon? Answer: No. Placing a pendulum scale takes a spell/trap zone, not a monster zone, and playing your card this way treats it as a continuous spell, not a monster. Therefore, it doesn't have the qualities of a monster and can't attack, defend, or be tributed for a tribute summon.