Here are two sentences:

Executive recruiters say that finding a seasoned chief merchandising officer will perhaps be the trickiest of all hires because there is such a dearth of good ones .

Executive recruiters say that finding a seasoned chief merchandising officer perhaps will be the trickiest of all hires .

no

Here are two sentences:

WinFS will require that applications be rewritten to exploit such capabilities .

However , applications will have to be rewritten to take advantage of such capabilities .

yes

Here are two sentences:

The board is investigating whether a shortage of funds in the shuttle program compromised safety .

The board is investigating whether this compromised safety on the shuttle .
yes