14.1 subject at the beginning of the phrase Rewrite the sentences so that the subject (Xis shifted to the beginning. Example It is unnecessary to do Xi X does not need to be done . 1. It is possible that X was modeled on Y. 2. It is advisable to use X. 3. It is necessary to do X first. It is mandatory to use X. 5. It is unlikely that X will be repeated. 6. It is probable that X will be needed. 1. X may have been modeled on Y. / X was possibly modeled on Y. 2. X should be used. 3. X must be done first X needs to be done / X has to be done first X must be used. 5. Xis unlikely to be repeated / X will probably not be repeated. 6. X will probably be needed / Xis likely to be needed.