period These traditions took a long period of time to evolve.
These traditions took a long time to evolve. She needs somewhere to live for a period of time.
She needs somewhere to live for a while. a (long/short) time/while (WITHOUT period): ‘You can stay here for a while, if you like.’ ‘Learning a foreign language can take a very long time.’ permission 1
To get a job in Switzerland, foreigners need a special permission.
To get a job in Switzerland, foreigners need special permission. Permission is an uncountable noun: ‘If you want to put up a tent, you’ll have to get the farmer’s permission.’ ‘Nobody is allowed to leave early without permission.’ perhaps 2
Perhaps I will even decide to get married after all.
I may even decide to get married after all. Perhaps it will be a good chance for you to have a rest.
It may be a good chance for you to have a rest. May/might usually sounds more natural than perhaps ... will: ‘My mother may need to have an operation.’ ‘You might feel that the course is too difficult.’ period These traditions took a long period of time to evolve.
These traditions took a long time to evolve. She needs somewhere to live for a period of time.
She needs somewhere to live for a while. a (long/short) time/while (WITHOUT period): ‘You can stay here for a while, if you like.’ ‘Learning a foreign language can take a very long time.’ permission 1
To get a job in Switzerland, foreigners need a special permission.
To get a job in Switzerland, foreigners need special permission. Permission is an uncountable noun: ‘If you want to put up a tent, you’ll have to get the farmer’s permission.’ ‘Nobody is allowed to leave early without permission.’
