| Features | Q1 | Q2 | Q3 | Q4 | |
| No. of responses | Ave | Std Dev | |||
| Overt subject only | 0 | 0 | 0 | 3.9 | 0.79 |
| Overt object only | 0 | 1 | 0 | 2.5 | 0.38 |
| Both overt | 1 | 1 | 0 | 3.6 | 1.37 |
| Both omitted | 9 | 9 | 11 | 4.8 | 0.39 |
| No difference | 1 | 0 | 0 | - | - |