The phrase "allow them to extend" is correct and usable in written English.
It can be used when giving permission or enabling someone or something to increase or lengthen in some way.
Example: "We need to allow them to extend their deadline to ensure they can complete the project successfully."
Alternatives: "permit them to expand" or "let them prolong".
The cold fall temperatures, by and large, won't allow them to extend the season the extra two or three months that ginger needs to mature fully.
They are adamant Rice's contract contains an option that will allow them to extend it until 2021 and they will not hesitate to activate that clause if necessary.
Pentagon officials said they would be looking in the next two months at "gray areas" that might allow them to extend some benefits to same-sex married couples in the military.
But Spectrum Bridge executives said that when the FCC finalizes its policies, they hope to replace the experimental system with a certified one, which would allow them to extend their license and to charge for service.
Among those concerns were removing the artificial barrier between the first and second undergraduate years imposed by pass/no-credit, and encouraging students to adopt flexible academic programs that might allow them to extend completion of core science requirements into their second year.
Greg Moore, the community's chief executive and a signatory of the letter, told Guardian Australia the current arrangement funds allow the Adnyamathanha people to care for the region between the Flinders Ranges and Gammon Ranges national parks but an increase would allow them to extend to neighbouring properties and employ more people.
In past years farmers would have harvested their crops by now, but this year's extended warm spell and the absence of a killing frost allowed them to extend their growing season, said Ross Eddy, the Hartford County executive director of the Farm Service Agency, an arm of the federal Department of Agriculture.
Jellyfish, for example, are using plastic as a habitat and to hitch a ride, allowing them to extend their range.
That in itself is a huge advantage: behemoths have lower costs of funding as a result, allowing them to extend cheaper loans.
Many states have received waivers that allowed them to extend federally subsidized health insurance to children in families whose incomes total twice the federal poverty line figure, or $41,300 for a family of four.
Obama recently expanded the remit of the US forces remaining in the country, allowing them to extend their counter-terrorism operations to Taliban, as well as al-Qaida, and to provide ground and air support for Afghan forces when necessary for at least the next two years.
