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Percentages correct, standard deviations and range for third-person singular present tense, total past tense verbs and grammatical ability
| Age | Third-person singular verbs | Total past tense verbs | Regular past tense | Irregular past tense | Grammatical ability |
|---|---|---|---|---|---|
| 3;0 | 74 (25) (33–100) | 60 (17) (39–83) | 64 (17) | 56 (18) | 67 (22) |
| 3;6 | 81 (28) (13–100) | 72 (29) (0–100) | 71 (27) | 73 (33) | 76 (28) |
| 4;0 | 87 (24) (22–100) | 80 (16) (45–100) | 80 (19) | 80 (18) | 83 (20) |
| total | 80 (25) | 71 (22) | 72 (21) | 70 (23) | 76 (24) |
