A suffix is a letter or group of letters added at the end of a word which makes a new word, so there are some examples on the slideshow. 

Past modal verbs are must, could, might and may with have + past participle to talk about suppositions or speculations regarding a past event. Students will speculate about Lior Suchard´s tricks 

sufixes-and-perfect-modals-for-speculation-conversation-topics-dialogs_145799.pptx

Suffixes and Perfect Modals for speculation

suffixes-and-perfect-modals-for-speculation

Let's do English ESL general grammar practice. A suffix is a letter or group of letters added at the end of a word which makes a new word, so there are some exa…