they were causing
Past progressive they conjugation of cause.

cause

It was believed that they were causing a drought.
On croyait qu'ils causaient la sécheresse.
It is quite true that some manufactured mineral fibres so closely mimicked the properties of asbestos that they were causing fibrosis, and were suspected of causing lung cancers.
Il est assez vrai que certaines personnes sont parvenues à créer des fibres minérales dont les propriétés sont si proches de celles de l'amiante qu'elles engendrent des fibroses et sont suspectées de causer des cancers du poumon.
The guard put some youths off the train because they were causing trouble.
Le contrôleur a fait descendre du train quelques jeunes qui causaient des problèmes.
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