[decided] [Jack and I] [last week] [a drone] [on the internet] [to buy]
Step 1: Identify the subject and the verb
Step 2: Put the verb behind the subject
Step 3: Are there any objects (lijdend voorwerp/meewerkend voorwerp)
Step 4: Is there an indication of time and place?
Step 5: Place goes before time (P before T)
Step 6: Are there any adverbs/parts left?
Step 7: Check! Wie doet wat waar wanneer?