Как определить когда ставится clever - cleverer - cleverest

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dear megan,

we are having a fantastic holiday! we arrived in paris last sunday. we stayed at the biggest hotel. have you ever been to paris? it is a beautiful city. i saw a lot of sights. yesterday i went to the fun park. it was one of the best days of my life. at the moment we are travelling by train to spain. we are arriving in madrid tomorrow morning. i think we will stay there for a week.

best wishes,

clare