"Entonces, debe de haber estado en casa."
Then, he must have been home... not sure the AT is really necessary here, but En is in the spanish sentence so it's all my fault, goodbye heart! :-)
Could someone tell me when it's appropriate to use 'haber' rather than 'ha' in these particular examples? I've tried and failed to find a pattern. Thanks
After the word "deber" (it can be conjugated in any form) ANY verb, no matter HOW MANY, is always in the infinitive form.