The study examined the grammatical errors of Technology student teachers' utterance structure. It was conducted to answer two questions: (1) what are the language backgrounds of the Technology student teachers; and (2) what are their common grammatical errors during the on-campus teaching. To address the first question, the participants were personally interviewed for their language profile utilizing the developed and modified interview guide. To address the second question, the participants' Technology classes were observed and video recorded for transcription. The findings show that misinformation and omission account for most of the total grammatical errors identified, with addition and ordering of elements being less frequent. It is observed that the student teachers repeatedly use the wrong forms of the words in place of the correct ones. These errors in their utterance structure are the results of the influence of their native language structures to produce a spoken discourse of the English language (L2). It can be noted then that grammatical errors on spoken discourse are different from written discourse as the spontaneous utterances encompass several errors. Data present a Philippine English variety based on the utterances of student teachers which are patterned on the Philippine language structures.