What does "Fourfold increase" mean? eg: This November 11th they spent a staggering 19 billion yuan on Alibaba’s online platforms—a fourfold increase on a year ago, and more than double what Americans spent online last Cyber Monday. Does "Fourfold increase" mean increase by 3 times or 4 times here?

Is "sexily" right here? Here is two lines in Desperate Housewives : LYNETTE: You look… ridiculous in that thing. TOM: Sexy ridiculous? Is "sexily ridiculous" right? Thanks!

Hi, my name is Shane Hre to give us a brief introduction of myself. My name is Shane, witch is also the name of the leader singer of WEST LIFE- my favorate band. I am now a students, living in Beijing, China. It is a wonderful city except a little crowed sometimes... I am now preparing for Toefl and GRE, thus learing English is almost the whole life for these days. I found English is quite interesting and I enjoy speaking or writing in this languege, although I am not good at it. I like making friends, and always dream of a life where I can hang out with several best friends anytime, just like the life in 'FRIENDS' -my favorate TV series. So, if you are also keen to music and English or you want to make friends with me, contact me~

'He said he can't face doing it by himself.' Why is 'can't' instead of 'couldn't' used here? Please help me with the difference between 'can' and 'could', thanks a lot !!