Cela faitForget the French structure and use a preposition. The preposition for expresses duration whereas since is used to refer to a starting point. plus d'une semaine que je suis souffrantUnwell / not well both refer to a temporary health problem while suffering (from) is used to refer to diseases, attacks, pain.. J'ai les jambes en cotonUse a dictionary to translate this metaphor. The noun cotton is used literally to talk about the plant or the fabric made from the cotton plant. et je me sens de plus en plus faibleThe basic rule for progressive increase is; short adjective + er (twice), or more and more + long adjective..