weinen
to cry
To shed tears as an expression of sadness, pain, or joy.
Das Kind begann zu weinen, als es hinfiel.
The child began to cry when it fell down.

to cry
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to cry
To shed tears as an expression of sadness, pain, or joy.
Das Kind begann zu weinen, als es hinfiel.
The child began to cry when it fell down.

Different prepositions are used to state the reason for crying. 'Weinen vor' + dative expresses an immediate emotional cause (e.g., joy, anger, pain). 'Weinen über' + accusative describes what one is crying about (e.g., a film, a joke).
Sie weinte vor Erleichterung, als sie die gute Nachricht hörte.
She cried with relief when she heard the good news.
The verb 'weinen' (to cry) is often intensified with adverbs to describe intensity. Common combinations are 'bitterlich weinen' (to cry bitterly), 'herzzerreißend weinen' (to cry heartbreakingly), or 'leise weinen' (to cry quietly).
Nach der Trennung hat er wochenlang bitterlich geweint.
After the breakup, he cried bitterly for weeks.
When 'weinen' (to mourn) means grieving for a person or a loss, the preposition 'um' with the accusative is always used. This construction expresses deep grief, often lasting for a longer time.
Die ganze Familie weinte um den verstorbenen Großvater.
The whole family mourned the deceased grandfather.
In the meaning 'sich beklagen' (to complain) or 'jammern' (to whine), 'weinen' is colloquial. It is often used disparagingly to express that someone is complaining about trivial things.
Wein nicht wegen der kleinen Schramme, das ist doch nicht so schlimm!
Don't whine about the little scratch; it's really not that bad!
to laugh
'lachen' and 'weinen' often stand as opposites for feelings. 'lachen' usually shows joy, fun, or amusement. 'weinen' usually shows sadness, pain, or strong emotions with tears. But the contrast is not always completely simple, because you can also cry from joy. Still, in everyday life: when someone reacts happily, they laugh; when someone is very sad or hurt, they cry.

Nach dem Unfall weinte das Kind, weil sein Knie weh tat.
After the accident, the child cried because his knee hurt.
Beim Abendessen lachen die Kinder über die lustige Geschichte.
At dinner, the children laugh at the funny story.