upgrade their qualifications

• I upgrade
• you upgrade
• you upgrade
• he/she/it upgrades
• we upgrade
• they upgrade

• I upgraded
• you upgraded
• you upgraded
• he/she/it upgraded
• we upgraded
• they upgraded

• I am upgrading
• you are upgrading
• you are upgrading
• he/she/it is upgrading
• we are upgrading
• they are upgrading

• I have upgraded
• you have upgraded
• you have upgraded
• he/she/it has upgraded
• we have upgraded
• they have upgraded

• I will upgrade
• you will upgrade
• you will upgrade
• he/she/it will upgrade
• we will upgrade
• they will upgrade

• I will have upgraded
• you will have upgraded
• you will have upgraded
• he/she/it will have upgraded
• we will have upgraded
• they will have upgraded

• I was upgrading
• you were upgrading
• you were upgrading
• he/she/it was upgrading
• we were upgrading
• they were upgrading

• I had upgraded
• you had upgraded
• you had upgraded
• he/she/it had upgraded
• we had upgraded
• they had upgraded

• I will be upgrading
• you will be upgrading
• you will be upgrading
• he/she/it will be upgrading
• we will be upgrading
• they will be upgrading

• I have been upgrading
• you have been upgrading
• you have been upgrading
• he/she/it has been upgrading
• we have been upgrading
• they have been upgrading

• I had been upgrading
• you had been upgrading
• you had been upgrading
• he/she/it had been upgrading
• we had been upgrading
• they had been upgrading

• I will have been upgrading
• you will have been upgrading
• you will have been upgrading
• he/she/it will have been upgrading
• we will have been upgrading
• they will have been upgrading

• upgrading

• upgraded

• having upgraded