Sentence examples for it has been necessary to replace from inspiring English sources

Now that such litter is commonplace, it has been necessary to replace (at $40,000 apiece) 63 outer windows on the various shuttles since the first was launched in 1981.

And it is necessary to replace all the Palestinian textbooks.

Therefore, it is necessary to replace equations as follows.

"Practically this (a downgrade) may mean the increase of capital outflow from Russia, which would be necessary to replace with instruments we have," Ulyukayev said.

Fertilizing is necessary to replace the soil's depleted nutrients.

Every substitution has been necessary.

It has been replaced.

Education Secretary Michael Gove had approved the sale in principle, which the school had said was necessary to raise money to replace buildings which dated back to the 1950s.

It is not necessary to replace them with new linens.

The decree, which Morsi had said was necessary to move Egypt's democratic transition forward, will be replaced by a modified version of the original declaration.

These observations raises the question of why it is necessary to have MEQs at all, but the potential dangers of replacing MEQs with MCQs must be considered.