Equation of state for dark energy in $f(T)$ gravity

We study the cosmological evolutions of the equation of state for dark energy $w_{\mathrm{D}\mathrm{E}}$ in the exponential and logarithmic as well as their combination $f(T)$ theories. We show that the crossing of the phantom divide line of $w_{\mathrm{D}\mathrm{E}}=-1$ can be realized in the combined $f(T)$ theory even though it cannot be in the exponential or logarithmic $f(T)$ theory. In particular, the crossing is from $w_{\mathrm{D}\mathrm{E}}>-1$ to $w_{$\mathrm{D}\mathrm{E}$} < -1$,intheoppositemannerfrom$f®$ gravity models. We also demonstrate that this feature is favored by the recent observational data.