Hi,<br/><br/>Are the following sentences natural to a native ear?<br/><br/>1. It was <b>good thing</b> that you told me about it beforehand.<br/><br/>2. It was <b>a good thing</b> that you told me about it beforehand.<br/><br/>3. It was <b>good </b>that you told me about it beforehand.<br/><br/>Thanks,<br/><br/>MG.