English for Today by Ganiu Abisoye Bamgbose
CONSONANT CLUSTERS
This has to do with the possibility of two or more consonants to be used at immediate succession. As non-native speakers, sometimes, we tend to either substitute one of the consonants or insert a vowel.
Substitution:
Little /ˈlɪt(ə)l/✔ /litu/✖
Bottle /ˈbɒt(ə)l/✔ /ˈbɒtu/✖
Insertion
Written /ritn/✔ /ritin/✖
Important /ɪmˈpɔːt(ə)nt/✔ /ɪmˈpɔːtɑːnt/
Certain /ˈsəːt(ə)n/✔ /ˈsəːteɪn/✖
GAB