Learn Swedish: Det är tråkigt att vara med och rensa ogräset.

Literally, vara med och means 'be with and'. In Swedish, it is a very common idiomatic way to express participating in an action, contributing, or 'helping' to do something. So vara med och rensa means participating in the pulling.

Why do we use och rensa instead of att rensa?

This uses a structure called pseudo-coordination. The phrase vara med links to the actual activity using och (and) rather than an infinitive marker like att (to). You are grammatically expressing one unified action as 'being involved AND pulling'.

Why is rensa in the infinitive form here?

In this vara med och structure, the second verb must exactly match the grammatical form of the first verb. Since the phrase uses att vara (infinitive), the second verb must also be the infinitive rensa. If it were in the present tense, it would be 'Jag är med och rensar' (I help pull).

Why is ogräset in the singular definite form when the English translation says 'the weeds' in the plural?

In Swedish, ogräs (weed) is frequently treated as an uncountable mass noun when referring to a patch of weeds or weeds in general. Therefore, ogräset (literally 'the weed') is the most natural way to say 'the weeds' in a garden.