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Are the following sentence, for two things going on at once, grammatically correct?
It feels like a conjunction is needed just because I usually don't hear it like that, but I don't know the grammar rules for sure.
edit: I wanted to know because a textbook used sentences like this. They sounded odd, so I wanted to make sure.
Grammatically, they're correct, but stylistically, they could be improved. If you added "and" or "while" to them, they would still be grammatically correct, and they would also be easier to understand. As SrJoven's comment pointed out, I saw an accident riding my bike, while grammatical, is ambiguous, and you typically want to avoid ambiguous sentences unless you are making one deliberately for a humorous effect.
Here's another example of an ambiguous sentence: I visited Mary and Susan, and she lent me a book. The sentence is grammatically correct, but it's still not a "good" sentence because it's not clear whether she refers to Mary or Susan.
You could augment the examples with "while" (whilst?), but all three are grammatically correct as they stand.
e.g.
Tom is doing laundry while singing a song.
or
Tom is doing laundry while he sings a song.
