It has been reported for decades that preschool children (age 4-7) tend to assign non-adult-like interpretations for sentences with pre-subject exclusive only. This study reports findings from two experiments investigating (1) the effects of (in)congruent implicit questions in discourse contexts and (2) word order transformation on children's interpretations of Mandarin pre-subject zhiyou 'only'. Experiment 1 showed that children performed non-adult-like in the incongruent discourse condition, similar to the patterns found in previous studies, but adult-like in the congruent discourse condition. Experiment 2 showed that using sentences similar to English 'Those who ate apples was only the boy' where the VP precedes the subject NP with zhiyou 'only' was not sufficient to overcome the processing difficulty caused by the incongruent discourse for preschool children. The results demonstrate that a congruent context taking the VP as the background (i.e., given and salient information) in Experiment 1, but not the syntactic manipulation in Experiment 2, is sufficient for children to interpret sentences with pre-subject zhiyou 'only' at an adult-like level of accuracy. The findings demonstrate that children have the syntactic knowledge for sentences with exclusive zhiyou 'only', but the discourse incongruence hinders them from correctly interpreting sentences with exclusive zhiyou 'only' when it is in pre-subject position. It has been reported for decades that preschool children (age 4-7) tend to assign non-adult-like interpretations for sentences with pre-subject exclusive only. This study reports findings from two experiments investigating (1) the effects of (in)congruent implicit questions in discourse contexts and (2) word order transformation on children's interpretations of Mandarin pre-subject zhiyou 'only'. Experiment 1 showed that children performed non-adult-like in the incongruent discourse condition, similar to the patterns found in previous studies, but adult-like in the congruent discourse condition. Experiment 2 showed that using sentences similar to English 'Those who ate apples was only the boy' where the VP precedes the subject NP with zhiyou 'only' was not sufficient to overcome the processing difficulty caused by the incongruent discourse for preschool children. The results demonstrate that a congruent context taking the VP as the background (i.e., given and salient information) in Experiment 1, but not the syntactic manipulation in Experiment 2, is sufficient for children to interpret sentences with pre-subject zhiyou 'only' at an adult-like level of accuracy. The findings demonstrate that children have the syntactic knowledge for sentences with exclusive zhiyou 'only', but the discourse incongruence hinders them from correctly interpreting sentences with exclusive zhiyou 'only' when it is in pre-subject position.