IN: Informal spoken English exhibits nearly universal use of the singular they. An examination by Jurgen Gerner of the British National Corpus published in 1998 found that British speakers regardless of social status, age, sex, or region used the singular they overwhelmingly more often than the gender-neutral he or other options.
can they/them be used as a singular pronoun?

OUT: yes

IN: The United States Virgin Islands (USVI; also called the American Virgin Islands), officially the Virgin Islands of the United States, is a group of islands in the Caribbean that is an insular area of the United States located 40 miles (64 km) east of Puerto Rico. The islands are geographically part of the Virgin Islands archipelago and are located in the Leeward Islands of the Lesser Antilles. It is the easternmost point (in terms of jurisdiction) and territory of the United States.
is the caribbean part of the united states?

OUT: no

IN: Window frost (also called fern frost or ice flowers) forms when a glass pane is exposed to very cold air on the outside and warmer, moderately moist air on the inside. If the pane is not a good insulator (for example, if it is a single pane window), water vapour condenses on the glass forming frost patterns. With very low temperatures outside, frost can appear on the bottom of the window even with double pane energy efficient windows because the air convection between two panes of glass ensures that the bottom part of the glazing unit is colder than the top part. On unheated motor vehicles the frost will usually form on the outside surface of the glass first. The glass surface influences the shape of crystals, so imperfections, scratches, or dust can modify the way ice nucleates. The patterns in window frost form a fractal with a fractal dimension greater than one but less than two. This is a consequence of the nucleation process being constrained to unfold in two dimensions, unlike a snowflake which is shaped by a similar process but forms in three dimensions and has a fractal dimension greater than two.
does frost form on the outside of a window?

OUT: yes

IN: There is an abundance of fish species in the Los Angeles River which include common carp, largemouth bass, tilapia, green sunfish, Amazon sailfin catfish, bluegill, black bullhead, brown bullhead, channel catfish, fathead minnow, crayfish, and mosquito fish. No native species of the Los Angeles River survived the channelization of the river in 1938. The native species of fish in the Los Angeles River included rainbow trout, river shrimp, chinook salmon, Sacramento pikeminnow, Pacific lamprey, three-spined stickleback, and Santa Ana sucker. The last native species to be caught in the river was a rainbow trout in 1940 by a local fisherman.
are there fish in the los angeles river?

OUT:
yes