Mobile phones are completed by advanced features.
OK let’s look at some examples of ‘completed by’:
- The questionnaires are completed by women aged 15–49.
- A complete site overhaul was completed by our editorial staff.
- The detailed project report has been completed by the consultants.
In all three examples we have to be + completed by + agent (the person doing the completing). In our opening example that would make ‘advanced features’ the agent, which is of course impossible.
Now let’s look at a slightly different use of ‘complete’.
- This building is complete with computer labs on every floor.
- Comes complete with all necessary connectors and detailed instructions.
- All of the recipes are complete with nutrition information.
In these examples we have to be (or ‘come’) + complete with + additional features (computer labs, connectors, nutrition information). OK so this must be what our writer meant to say:
- Mobile phones are complete with advanced features.
Completed by (2)
Actually there is a third possibility:
- The project should be completed by 2017.
- The restoration was completed by February 1971.
Here we have to be + completed by + time expression (the deadline for completion).
Now try this quick practice activity: