What is the hybridisation of $\ce{F}$ in $\ce{BF3}$ or $\ce{CH3F}$ or $\ce{PF5}$ or $\ce{SF6}$? My book states that the p orbitals of fluorine overlaps, but I feel that sp<sup>3</sup> hybridisation occurs in $\ce{F}$, so its sp<sup>3</sup> hybrid orbital overlaps with the empty p orbital of boron.

According to [Ron's answer](https://chemistry.stackexchange.com/a/14010/41400),  all atoms with p or d orbitals can hybridise.