सकारात्मक (Affirmative) वाक्यों में निम्नलिखित में से किस शब्द का प्रयोग स्वीकारात्मक (Assertive) रूप में किया जाता है?

Find the part of the sentence that has a grammatical error: 'I came to invite you to my poor house and offers you my service.'

Find the part of the sentence that has a grammatical error: 'Yesterday afternoon we have been steaming over a summer sea.'