In one sentence, describe what the following article is about: If you determine that omitting the clause changes the meaning of the sentence, you need to use "that" in your sentence. For example, in the sentence "I like dogs that are brown," the clause "that are brown" is crucial to understanding the sentence; it limits what type of dogs you like. If omitting the clause only removes additional information from the sentence, you need to use "which" in your sentence. For example, in the sentence "I took the firetruck, which is my niece's favorite toy, to be fixed," the clause "which is my niece's favorite toy" only adds information to the sentence. You're taking the firetruck to be fixed the fact that the truck is your niece's favorite doesn't change the meaning of the sentence. If you're creating a non-restrictive clause and therefore using "which" in your sentence, the clause should usually be surrounded by commas. In some cases, though, you may also use dashes or parentheses to separate a non-restrictive clause. For example, "I love lobster, which is expensive, because it reminds me of growing up by the ocean," would still have the same meaning without "which is expensive." Therefore, "which is expensive" is the phrase you should surround with commas. If you know you have a non-restrictive clause and need to use "which," but don't know where to put the commas, test it. Your sentence should still make sense if you take out the words surrounded by commas.
Summary: Use "that" for restrictive clauses. Use "which" for non-restrictive clauses. Determine where you should place commas.

In one sentence, describe what the following article is about: Sweet plantains give a little when you press them. Their skins are mottled yellow and brown. If you find green plantains, give them several days to ripe before you make your sweet dessert dish. Use a paring knife to chop the ends off the plantains. Use your fingers to pull back the peel and remove it from the fruit inside. Discard the peel. Lay the plantains on a cutting board and slice them into 1/2-inch pieces. If you like thicker plantains, slice them into 1-inch pieces. For thin, crispy plantains, slice them into 1/4-inch pieces. Pour the oil into a stockpot or frying pan so that it rises up the sides 12 inch (1.3cm). Heat the oil until a deep frying thermometer reads 340 degrees. For a less oil-heavy dish, add just a bit of oil to a frying pan and heat it until it sizzles when you add a bit of plantain to the pan. Lay them in the hot oil and fry them until they're brown and crispy on one side, which should take about 2 minutes. Flip them over and fry them on the other side until both sides are golden brown. The longer they fry, the sweeter they'll taste. Remove them from the hot oil and place them on a paper-towel-lined plate to drain completely. Sprinkle them with sugar and cinnamon to taste. For a truly delectable dish, make a fresh batch of whipped cream to top the fried sweet plantains.
Summary: Pick out ripe, sweet plantains. Peel the plantains. Slice them on the diagonal. Heat the oil. Fry the plantains. Drain the plantains. Serve them hot with sugar.

In one sentence, describe what the following article is about: Using a plugging chisel and sledge, chip the cinder block into pieces. Remove the block in chunks as you free each piece from the surrounding mortar. Chip out the mortar, then brush away any additional dust or debris before putting the new block in place. Wear safety goggles while chipping the block out to prevent eye injuries. Purchase a bag of pre-mixed mortar and pour it into a bucket or wheelbarrow. Add the required amount of water and stir it with a shovel until it has an even consistency. Let the mix sit for 3-5 minutes before applying it to the wall to let the mortar absorb moisture so it will stick to the cinder blocks better. Using a trowel, add a 1 inch (2.5cm) thick layer of mortar around the top, bottom, and sides of the empty space in the wall. Keep the layer as even as possible to avoid creating tight or loose sections in the wall. Slip the new cinder block in place with a trowel, then scrape away any excess mortar. Let the mortar dry for 12-24 hours, depending on the mix. When the mortar is dry and stable, it should turn a light gray color.
Summary:
Chip out the old cinder block and mortar. Mix the mortar. Apply mortar around the edges of the cavity. Set the new block in place.