These expressions are used to indicate intensity, cause and effect, or establish conditions in French sentences.
«Si»
The expression «si» is used to express a condition or a very strong intensity. In the context of intensity, «si» is often followed by an adjective or an adverb.
- Il fait si froid que l'eau a gelé. (It is so cold that the water froze.)
- Elle était si heureuse qu'elle a pleuré. (She was so happy that she cried.)
«Tellement que / Tant que»
The expressions «tellement que / tant que» are used to express cause and effect, indicating that a situation or an action directly leads to a consequence.
- Il a tellement mangé qu'il se sent mal. (He ate so much that he feels sick.)
- Elle a tellement couru qu'elle est épuisée. (She ran so much that she is exhausted.)
- Il a tant dormi qu'il est arrivé en retard. (He slept so much that he was late.)