Introductory "it"

To become a millionaire was his life-long ambition.

To err is human, to forgive, divine.

• It is human to err; but it is divine to forgive.

• It is human to err; but forgiving is divine.

• It is human to err; it is divine to forgive.

To accept your advice is difficult.

Now do the opposite:

"It was difficult to understand his motive."

• To understand his motive was difficult.

• To understand motive was difficult.

• To understand his motive difficult.

To get such an offer must be tempting.

• It must be tempting getting such an offer.

• It must be tempting to get such an offer.

• It must be tempting having such an offer to get.

To consult specialists must be advisable.

To think of it now would be premature.

Do the opposite now:

"It could be dangerous to drive so fast."