In this forum we don't judge the correctness of sentences by reference to ESL books that offer gross simplifications (although proper grammars, academic papers, etc, are OK).
So here are some real-world examples:
"If you are purchasing, we will transfer your sale proceeds across to your purchase file so that we can use the funds." (A seller's guide to conveyancing, Howard and Over, UK.)
"...if you are buying a vehicle through us, we will apply the trade-in value to save you tons of dough on taxes" (FAQ, CarDoor website, Canada)
"If you are looking for prenatal care, we will work hard to connect you to another provider in the community, such as a midwife or a doctor, who can provide you with full prenatal services whether or not you have a health card." (Planned Parenthood Toronto, Canada)
"If you are using Fastlane, we will also use your Personal Information and payment method details to determine whether the payment you are making with a participating Partner or Merchant is authorized by you and likely to be successfully authorized by the payment method you choose to use when you make a purchase using details from your Fastlane profile." (PayPal Privacy Statement, PayPal website, US.)
"If you are not getting pension credit, we will add together any income, including earnings if you work and any state benefits that you and your partner (if you have one) have." (Ealing Council website, UK)