English normally uses side by side or from side to side. The shorter forms by side and to side are usually incomplete.
Use side by side for things next to each other and from side to side for movement across an area. By side and to side alone are not standard fixed expressions.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use side by side for people or objects positioned beside one another.
Use from side to side for repeated movement across a space.
Use to one side for something moved away from the middle.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
The fixed phrase is side by side.
✕ They sat by side. ✓ They sat side by side.Movement expressions usually need from side to side.
✕ The door swung to side. ✓ The door swung from side to side.Beside is a preposition, while side by side is a phrase.
✕ They walked beside side. ✓ They walked side by side.Do not insert the between the repeated nouns.
✕ They stood side by the side. ✓ They stood side by side.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Not usually. English uses the full phrase side by side.
It means next to each other.
Use it to describe movement across an area or repeated motion.
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