Here are two possible perlocutionary effects for each utterance:
(1) Neighbour to recently bereaved widow:
- The widow is overwhelmed with emotion and begins weeping
- The widow feels grateful for the expression of sympathy
(2) Lecturer to student: 'You'll find the book on Swahili infinitives quite fascinating'
- The student feels amused at the lecturer's enthusiasm
- The student feels annoyed, thinking the lecturer is being sarcastic