Formal:
* The researchers obtained permission to conduct their study.
* It was difficult to obtain a visa to travel to that country.
* Students must obtain a passing grade on the exam to graduate.
Informal:
* I finally obtained a reservation at that popular restaurant.
* I need to obtain some information about the project.
* It's important to obtain the right tools for the job.
With different tenses:
* I will obtain the necessary documents tomorrow. (future tense)
* She obtained her driver's license last month. (past tense)
* They are obtaining funding for their new business. (present continuous tense)
With different word forms:
* The obtainable information was limited. (adjective)
* The company's objective is to obtain a larger market share. (verb)
* The obtainable solution to the problem was unclear. (adjective)
You can also use synonyms for "obtain" to vary your writing, such as:
* Get
* Acquire
* Secure
* Receive
* Gain
* Attain
Remember to choose the best word for the context of your sentence!