C'est si haut que je tremble !

Questions & Answers about C'est si haut que je tremble !

Why does the sentence use si ... que here instead of just très?
In French, when you want to express a consequence like 'so [adjective] that...', you use the structure si ... que (or tellement ... que). If you used très (very), you would just be stating a fact (C'est très haut) and couldn't smoothly attach the result (que je tremble).
Could I use tellement instead of si in this sentence?
Yes! You can absolutely say C'est tellement haut que je tremble ! When placed before an adjective like haut, both si and tellement mean 'so' and are completely interchangeable in this consequence structure.
Why do we use C'est to say 'It is' instead of Il est?
We use c'est when making a general observation or commenting on an overall situation (like looking down from a high place). You would only use il est if 'it' referred back to a specific masculine noun you just mentioned, like le mur (the wall).
The translation says 'I am shaking', but the French is just je tremble. Should it be je suis en train de trembler?
The simple present tense in French (je tremble) translates to both 'I tremble' and 'I am shaking'. While you could use je suis en train de trembler to strongly emphasize that the action is happening right this second, the simple present is much more natural and common here.

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