The phrase "and unable to extend" is correct and usable in written English.
It can be used to describe a situation where someone or something cannot be prolonged or expanded.
Example: "The deadline for submissions has passed, and we are now unable to extend the time for any further entries."
Alternatives: "and not able to extend" or "and incapable of extending".
Karyn, who dedicated herself to the uplifting of dark-skinned black girls and women, and worked so that they would have a sense of well-being, was struggling with depression and mental illness, and was unable to extend the love she gave to others to herself.
In this study, we assessed the motor deficits by visual inspection and used the time when all the animals had developed hindleg stiffness and were unable to extend their hindlimbs when suspended by the tail as the endpoint (20 weeks of age).
Some bivalves, such as oysters and most scallops, are unable to extend their foot and in them, these muscles are absent.
They can't do both.' According to his friends, colleagues and relatives, Laing was frequently unable to extend the compassion he felt for his patients to his own family.
These people said he reported that not only are military operations facing a stalemate, unable to extend and sustain security beyond the perimeters of their bases, but also local governments in the province have collapsed and the weak central government has almost no presence.
Such requirements limited the number of lineages that could be sampled, and therefore, we are presently unable to extend the generality of our findings to plants or protozoans.
"James worked his socks off while he was with us and it is unfortunate we have been unable to extend his short-term contract further into the season," said Pirates head coach Ian Davies.
Recruitment of women without a stable partner was slow and, due to financial constraints, we were unable to extend the recruitment process.
While Mr. Gensler and Mr. Chilton are outnumbered, the agency is unable to extend the deadline unless the chairman approves.
On November 1 , 2011 the band was on board LOT Polish Airlines Flight 16 when the crew were unable to extend the landing gear and were forced to land the aircraft on its belly.
